10/4/2017 3:40 PM Middleware::Communication Download: http://10.5.2.127/fog/management/other/ssl/srvpublic.crt
10/4/2017 3:40 PM Middleware::Communication ERROR: Could not download file
10/4/2017 3:42 PM Middleware::Communication Download: http://10.5.2.127/fog/management/other/ssl/srvpublic.crt
10/4/2017 3:42 PM Data::RSA FOG Server CA cert found
So on 3:40 PM downloading the cert from the FOG server did not work but it went all fine just two minutes later. So I guess there is something wrong with your network there. Did you ever try downloading the cert (http://10.5.2.127/fog/management/other/ssl/srvpublic.crt) from exactly that machine having the fog-client issue? Please try several times in a row and see if you can always fully download the cert.
From the logs it does not look like a general fog-client issue. Maybe also check the apache webserver logs (see my signature on where to find those) and see if you can match up an error message in those logs with the timestamps of your client log…