@Tom-Elliott Hi, sorry for the delayed response. I updated both the Fog server and storage node, but the same error is thrown at the end of multicasting.

@Tom-Elliott Absolutely. I will get back to you in a few hours.

@Tom-Elliott

Yes, it looks like multicast is working correctly. Thank you for the support.

I also want to add a few details to clarify our setup.

A few months ago, I was running version 1.15.10. Since we are developing an API-based solution, we decided to upgrade to the latest development branch.

During the upgrade, I noticed that when the message appeared telling me to visit /fog/management to update the database, no database update actually took place. Instead, the web interface took me straight to the FOG login page.

If I understood that correctly, it suggests there were no database schema changes between 1.15.10 and 1.6. However, that later led me to question my understanding, because several issues arose afterward, including the one mentioned in this post: “Database Update: Failed.”

I will add the other issues to the forum soon and link them here.

@Tom-Elliott

FOG version: 1.6.0-beta.2273

Let’s ignore the Snapin errors for now. The error is thrown at the end of the Multicasting image.

@Tom-Elliott

FOG version: working-1.6
commit: f61a90d97

The history of the days we noticed the issue. One thing I want to point out is that unicasting doesn’t throw that error.

| 2119 | [2026-03-05 09:22:52] Task ID:  Name: Multiple Snapin -- orig Single has failed to save. Error: Required database field is empty: hostID    | iina     | 2026-03-05 09:22:52 | 10.24.193.157  |
| 2120 | [2026-03-05 09:23:03] Task ID: 3714 NAME: Wake-Up Task - 6037-GOLD 2026-03-05 09:23:03 has been successfully updated.                       | fog      | 2026-03-05 09:23:03 | 172.28.172.92  |
| 2122 | [2026-03-05 09:23:04] Task ID: 3714 NAME: Wake-Up Task - 6037-GOLD 2026-03-05 09:23:03 has been successfully updated.                       | fog      | 2026-03-05 09:23:04 | 172.28.172.92  |
| 2123 | [2026-03-05 09:23:54] Task ID:  Name: Multiple Snapin -- orig Single has failed to save. Error: Required database field is empty: hostID    | iina     | 2026-03-05 09:23:54 | 10.24.193.157  |
| 2124 | [2026-03-05 10:27:19] ScheduledTask ID: 4 NAME: Multi-Cast Task has been successfully updated.                                              | le.do    | 2026-03-05 10:27:19 | 10.24.193.251  |
| 2125 | [2026-03-05 10:34:39] ScheduledTask ID: 5 NAME: Multi-Cast Task has been successfully updated.                                              | le.do    | 2026-03-05 10:34:39 | 10.24.193.251  |
| 2126 | [2026-03-05 14:26:47] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-05 14:26:47 | 172.28.171.22  |
| 2127 | [2026-03-05 14:27:16] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-05 14:27:16 | 172.28.171.22  |
| 2128 | [2026-03-05 14:58:43] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | le.do    | 2026-03-05 14:58:43 | 10.24.193.251  |
| 2129 | [2026-03-05 15:04:36] ScheduledTask ID: 10 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-05 15:04:36 | 10.24.193.251  |
| 2130 | [2026-03-05 15:08:03] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | le.do    | 2026-03-05 15:08:03 | 10.24.193.251  |
| 2131 | [2026-03-05 15:08:39] ScheduledTask ID: 11 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-05 15:08:39 | 10.24.193.251  |
| 2132 | [2026-03-05 15:13:38] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | le.do    | 2026-03-05 15:13:38 | 10.24.193.251  |
| 2133 | [2026-03-05 15:15:50] ScheduledTask ID: 12 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-05 15:15:50 | 10.24.193.251  |
| 2134 | [2026-03-05 15:49:11] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-05 15:49:11 | 172.28.172.92  |
| 2135 | [2026-03-05 16:13:34] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-05 16:13:34 | 172.28.171.193 |
| 2136 | [2026-03-05 16:13:47] MulticastSession ID: 141 NAME: Multi-Cast Task - sysprep-test-5004 2026-03-05 16:13:46 has been successfully updated. | fog      | 2026-03-05 16:13:47 | 172.28.171.193 |
| 2137 | [2026-03-06 09:15:12] Group ID: 41 NAME: Le.Do (api-test) has been successfully updated.                                                    | le.do    | 2026-03-06 09:15:12 | 10.24.193.251  |
| 2138 | [2026-03-06 09:15:27] ScheduledTask ID: 14 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-06 09:15:27 | 10.24.193.251  |
| 2139 | [2026-03-06 09:18:47] ScheduledTask ID: 15 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-06 09:18:47 | 10.24.193.251  |
| 2140 | [2026-03-06 09:45:04] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-06 09:45:04 | 172.28.172.92  |
| 2141 | [2026-03-06 09:45:21] MulticastSession ID: 142 NAME: Multi-Cast Task - sysprep-test-5004 2026-03-06 09:45:21 has been successfully updated. | fog      | 2026-03-06 09:45:21 | 172.28.172.92  |
| 2142 | [2026-03-06 10:37:18] Group ID: 41 NAME: Le.Do (api-test) has been successfully updated.                                                    | le.do    | 2026-03-06 10:37:18 | 10.24.193.251  |
| 2143 | [2026-03-06 10:37:32] ScheduledTask ID: 16 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-06 10:37:32 | 10.24.193.251  |
| 2144 | [2026-03-06 11:11:22] ScheduledTask ID: 17 NAME: Multi-Cast Task has been successfully updated.                                             | fog      | 2026-03-06 11:11:22 | 172.28.172.92  |
| 2145 | [2026-03-06 12:10:27] ScheduledTask ID: 18 NAME: Multi-Cast Task has been successfully updated.                                             | fog      | 2026-03-06 12:10:27 | 172.28.172.92  |
| 2146 | [2026-03-06 12:20:58] ScheduledTask ID: 19 NAME: Multi-Cast Task has been successfully updated.                                             | fog      | 2026-03-06 12:20:58 | 172.28.172.92  |
| 2147 | [2026-03-06 12:39:43] Group ID: 42 NAME: sysprep-test-5004 has been successfully updated.                                                   | fog      | 2026-03-06 12:39:43 | 172.28.171.193 |
| 2148 | [2026-03-06 12:39:59] MulticastSession ID: 145 NAME: Multi-Cast Task - sysprep-test-5004 2026-03-06 12:39:58 has been successfully updated. | fog      | 2026-03-06 12:39:59 | 172.28.171.193 |
| 2149 | [2026-03-06 15:50:17] ScheduledTask ID: 20 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-06 15:50:17 | 10.24.193.251  |
| 2150 | [2026-03-06 16:21:15] ScheduledTask ID: 22 NAME: Multi-Cast Task has been successfully updated.                                             | le.do    | 2026-03-06 16:21:15 | 10.24.193.251  |
| 2151 | [2026-03-09 09:19:06] Task ID:  Name: Multiple Snapin -- orig Single has failed to save. Error: Required database field is empty: hostID    | iina     | 2026-03-09 09:19:06 | 10.24.193.58   |
| 2152 | [2026-03-09 09:19:14] Host ID: 66 NAME: 6037-GOLD has been successfully updated.                                                            | iina     | 2026-03-09 09:19:14 | 10.24.193.58   |
| 2153 | [2026-03-09 09:19:25] Task ID:  Name: Multiple Snapin -- orig Single has failed to save. Error: Required database field is empty: hostID    | iina     | 2026-03-09 09:19:25 | 10.24.193.58   |
+------+---------------------------------------------------------------------------------------------------------------------------------------------+----------+---------------------+----------------+

@Tom-Elliott Hi Tom, Sorry, my bad. I don’t get Login incorrect message. Mine is saying, No active task found for Host <Hostname>. But the error is the same, could not Update database. Also, I am using the latest working-1.6.

I don’t know if these errors are relevant, but my Multicast was around 12:30.

masih@fog:~$ sudo tail -n 200 /var/log/apache2/error.log
[Fri Mar 06 00:00:03.749336 2026] [mpm_prefork:notice] [pid 119135] AH00163: Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 configured -- resuming normal operations
[Fri Mar 06 00:00:03.749408 2026] [core:notice] [pid 119135] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 06 09:45:22.809081 2026] [proxy_fcgi:error] [pid 188212] [client 172.28.172.92:11308] AH01071: Got error 'PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined array key "msaID" in /var/www/html/fog/lib/router/route.class.php on line 2515PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined variable $stat in /var/www/html/fog/lib/fog/group.class.php on line 772', referer: http://fog/fog/management/index.php?node=group&sub=edit&id=42
[Fri Mar 06 10:11:51.346904 2026] [proxy_fcgi:error] [pid 148942] [client 172.28.1.83:58320] AH01071: Got error 'PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined array key "msaID" in /var/www/html/fog/lib/router/route.class.php on line 2515PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined variable $stat in /var/www/html/fog/lib/fog/group.class.php on line 772'
[Fri Mar 06 11:00:16.168016 2026] [mpm_prefork:notice] [pid 119135] AH00170: caught SIGWINCH, shutting down gracefully
[Fri Mar 06 11:00:55.671950 2026] [mpm_prefork:notice] [pid 845] AH00163: Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 configured -- resuming normal operations
[Fri Mar 06 11:00:55.675999 2026] [core:notice] [pid 845] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 06 11:27:39.854967 2026] [proxy_fcgi:error] [pid 895] [client 172.28.172.92:43525] AH01067: Failed to read FastCGI header, referer: http://fog/fog/management/index.php?node=task&sub=activescheduled
[Fri Mar 06 11:27:39.855265 2026] [proxy_fcgi:error] [pid 895] (104)Connection reset by peer: [client 172.28.172.92:43525] AH01075: Error dispatching request to : , referer: http://fog/fog/management/index.php?node=task&sub=activescheduled
[Fri Mar 06 11:27:39.907972 2026] [mpm_prefork:notice] [pid 845] AH00170: caught SIGWINCH, shutting down gracefully
[Fri Mar 06 11:27:49.405096 2026] [mpm_prefork:notice] [pid 4373] AH00163: Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 configured -- resuming normal operations
[Fri Mar 06 11:27:49.405283 2026] [core:notice] [pid 4373] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 06 11:39:00.840026 2026] [mpm_prefork:notice] [pid 4373] AH00170: caught SIGWINCH, shutting down gracefully
[Fri Mar 06 11:39:35.371742 2026] [mpm_prefork:notice] [pid 840] AH00163: Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 configured -- resuming normal operations
[Fri Mar 06 11:39:35.372374 2026] [core:notice] [pid 840] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 06 12:39:59.781079 2026] [proxy_fcgi:error] [pid 1514] [client 172.28.171.193:43267] AH01071: Got error 'PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined array key "msaID" in /var/www/html/fog/lib/router/route.class.php on line 2515PHP message: PHP Warning:  Undefined array key "hostID" in /var/www/html/fog/lib/router/route.class.php on line 2733PHP message: PHP Warning:  Undefined variable $stat in /var/www/html/fog/lib/fog/group.class.php on line 772', referer: http://fog/fog/management/index.php?node=group&sub=edit&id=42```

@JGeear, I have the same problem. But I’m running the latest 1.6-working version.

@Tom-Elliott Hi Tom,

Thank you, that clarifies a lot. I now understand that hostSecTime represents the expiration time, not the creation time, which fully explains the consistent +30 minute offset I was seeing. That part now makes sense and resolves my question.

The only remaining actual issue I’m trying to understand is the snapin behavior: in several cases, snapins did not execute on some hosts. I don’t see any errors in the logs. Only that the snap-in task doesn’t start, but I will work on this and gather some more data. Thank you!

@GRISLET

Hi,

I am not an expert on the technicalities, and someone with more experience may be able to explain it better. However, I can confirm that there is no issue capturing and deploying Windows 11 with FOG 1.15. I capture and deploy Windows 11 weekly without any problems. I mainly use the Single Disk (Everything) option, but I have also used multi-partition successfully.

Based on your description, it sounds like your configuration is not capturing the boot partition. As a result, when the image finishes deploying, the system cannot find a valid boot mechanism and falls back to network boot.

I am not aware of any completion message on the server. As far as I know, once the progress bar in the Task tab reaches 100%, the image has been fully cloned to the computer. Can you confirm if that is what you are seeing?

Hello,

We are seeing a persistent encryption/token issue in FOG 1.5.10.16. There is also a consistent timestamp anomaly, and while both occur together, I do not know if they are directly related.

Problem 1:

Every time the FOG Client authenticates (for example, after a reboot), a new token is generated, and shortly after that, the “Reset Encryption Data” button reappears automatically in the UI.
I am not sure if this is expected behavior by design, but I have observed that some snapin tasks do not execute unless the encryption data is manually reset first.

Problem 2:

Separately, there is a consistent +30 minute offset between the database value hosts.hostSecTime and all real system clocks. The offset is always exactly +30 minutes ahead of:

hosts.hostSecTime in MariaDB is always written exactly +30 minutes ahead of: FOG server time (date), MariaDB NOW(), Windows client time (Get-Date), token.dat LastWriteTime on the client.

Example data from Host with ID 66:

PS C:\Users\Administrator> Get-Item "C:\Program Files (x86)\FOG\token.dat" | Select LastWriteTime

LastWriteTime
-------------
03/12/2025 9.45.58

And

MariaDB [fog]> SELECT hostSecTime FROM hosts WHERE hostID = 66;
+---------------------+
| hostSecTime         |
+---------------------+
| 2025-12-03 10:15:58 |
+---------------------+
1 row in set (0.000 sec)

All systems (FOG server, storage node, Windows clients) are correctly NTP-synchronized.

Questions

Is it normal for “Reset Encryption Data” to reappear after every reboot?
Is the +30 minute offset in hostSecTime expected or a known issue in 1.5.10?
Could either of these independently explain intermittent snapin failures?

Cheers!

@Tom-Elliott Hello,

I’m experiencing the same issue with the settings. Now that the fix has been pushed, what’s the correct way to resolve it?

Do I need to reinstall FOG, or is pulling the update and restarting sufficient?

Hi,

I discovered that netboot.xyz offers a simple live installation. Can someone guide me on how to load the correct Netboot.xyz in FOG so I can install my desired OS? By that I mean have a FOG menu entry that loads the correct netboot.xyz file.

Thank you!

Hi everyone,

I have three rooms, each containing several identical computers. These rooms are all on the same VLAN, connected across multiple switches without any router in between. Multicasting works successfully in one of the rooms where I have two test computers. However, in the other rooms with more computers, the multicast starts fine but drops to zero speed at around 80% completion, causing FOG to disconnect the clients. Our IT department informed me that IGMP snooping is enabled on the switches. Does anyone have suggestions on what I should do?

Thanks!

Here are the multicasting logs from FOG:

[09-05-24 12:23:01 pm] Task started
Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p1.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.152  (#0) 00000009
New connection from 172.28.172.246  (#1) 00000009
New connection from 172.28.171.93  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes= 31 988 620  re-xmits=0000000 (  0.0%) slice=0112 -   0
Transfer complete.
Disconnecting #0 (172.28.171.152)
Disconnecting #1 (172.28.172.246)
Disconnecting #2 (172.28.171.93)
Disconnecting #3 (172.28.171.248)

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p2.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.93  (#0) 00000009
New connection from 172.28.171.152  (#1) 00000009
New connection from 172.28.172.246  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes=          754  re-xmits=0000000 (  0.0%) slice=0112 -   0
Transfer complete.
Disconnecting #0 (172.28.171.93)
Disconnecting #1 (172.28.171.152)
Disconnecting #2 (172.28.172.246)
Disconnecting #3 (172.28.171.248)

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p3.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.152  (#0) 00000009
New connection from 172.28.172.246  (#1) 00000009
New connection from 172.28.171.93  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes=383 545 344  re-xmits=0003052 (  1.1%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=260
bytes=  1 096 595K re-xmits=0006569 (  0.8%) slice=0112 -   32
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=143
bytes=  1 128 445K re-xmits=0006610 (  0.8%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=343
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=497
bytes=  1 238 487K re-xmits=0007656 (  0.8%) slice=0112 -   3
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=576
bytes=  1 302 505K re-xmits=0009546 (  1.0%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=402
bytes=  1 567 179K re-xmits=0010179 (  0.9%) slice=0112 -   3
Timeout notAnswered=[2,3] notReady=[2,3] nrAns=2 nrRead=2 nrPart=4 avg=824
bytes=  3 664 342K re-xmits=0017061 (  0.6%) slice=0112 -   1
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=1792
bytes=  4 463 299K re-xmits=0019621 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=599
bytes=  4 563 468K re-xmits=0020107 (  0.6%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=641
bytes=  4 778 296K re-xmits=0020577 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=119
bytes=  5 007 297K re-xmits=0020734 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=485
bytes=  6 070 450K re-xmits=0023146 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0] notReady=[0] nrAns=3 nrRead=3 nrPart=4 avg=613
bytes=  6 260 436K re-xmits=0023887 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=508
bytes=  6 444 369K re-xmits=0024305 (  0.5%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=443
bytes=  6 847 431K re-xmits=0026738 (  0.5%) slice=0112 -   1
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=410
bytes=  6 978 812K re-xmits=0027410 (  0.5%) slice=0112 -   0
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=345
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=483
bytes=  7 469 939K re-xmits=0030905 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=458
bytes=  8 012 982K re-xmits=0031040 (  0.5%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=730
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=609
bytes=  8 057 413K re-xmits=0031341 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=416
bytes=  8 325 590K re-xmits=0031799 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=277
bytes=  8 393 430K re-xmits=0031799 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=432
bytes=  9 791 645K re-xmits=0038831 (  0.5%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=515
bytes= 10 154 417K re-xmits=0040422 (  0.5%) slice=0112 -   3
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=275
bytes= 10 450 781K re-xmits=0041730 (  0.5%) slice=0112 -   0
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=476
bytes= 10 521 966K re-xmits=0041866 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=665
bytes= 10 534 387K re-xmits=0043371 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=819
bytes= 10 592 832K re-xmits=0044592 (  0.5%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=449
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=511
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=553
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=557
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=618
bytes= 10 723 895K re-xmits=0048043 (  0.6%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=400
bytes= 11 625 887K re-xmits=0051194 (  0.6%) slice=0112 -   1
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=538
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Dropping client #3 because of timeout
Disconnecting #3 (172.28.171.248)
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Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
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Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Dropping client #0 because of timeout
Disconnecting #0 (172.28.171.152)
Dropping client #1 because of timeout
Disconnecting #1 (172.28.172.246)
Dropping client #2 because of timeout
Disconnecting #2 (172.28.171.93)
bytes= 15 955 894K re-xmits=0077055 (  0.6%) slice=0112 -   1
Transfer complete.

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p4.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1

@george1421

The problem was the IGMP Snooping as you suspected. Thank you for your help.

@TaTa

Thank you for your reply. I didn’t try your solution but after IGMP Snooping was configured on the VLAN, the multicasting worked immediately.

I left all the Fog multicasting settings as default.

@george1421 Thank you for the clarification and your good advice. I will look into it further.

I’m having trouble with multicasting and suspect it’s because there are several switches between the Fog server and the host computer, even though they’re all on the same VLAN. After checking the documentation, I’m still unsure which port numbers need to be allowed for multicasting to work correctly. The Web UI indicates that port 63100 is the default for broadcasting, and Udpcast uses port 9000 and port 9001.

I’m not an expert in networking, so I would appreciate it if someone could tell me if I need to ask our networking team to open specific ports on that VLAN for multicasting. Any other advice would also be very helpful. Thank you!