Hi Marcin, Thanks for the quick response on this. Still getting the same error unfortunately. I'm starting to think it's not a Symnatec/Firewall issue, as my colleagues PCs are setup the same in this regard.
Im pretty sure that Symantec / Firewall are making troubles.
Its a quote from Essential Objects (one of ZS libraries) support:
"Hi,
Please check if the user has any AntiVirus programming running on his machine. If they do, please try to temporarily disable it and see if it works for you.
Thanks!"
If you could disconnect yourself from the Internet for a while, turn off firewall and Symantec we would know for sure.