@tom-elliott problem solved, i talked to our firewall admin to free the server from proxy usage, after that i could easily add my pushbullet account and could also simply download the current oui.txt for the mac list.
So i am going to think that something is wrong with group the fog server belongs to on our firewall server because it already was in a group that is free from forced proxy usage (must be some missconfiguration or something).
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Regards X23