I dont know exactly how this works but I have tried with both Sygates personal firewall pro and Zone Alarm pro with the exakt same result.
(Latest versions of both)
 
When I install Symantecs VPN client it somehow disconects the settings of the firewall and suddenly all my other applications cant get access to the internet. After a while they get back online again but with problems...
Without any reason they could be blocked again and nothing works...
My FTP server is impossible to reach from outside as long as the VPN client is installed... after uninstalling it and a reboot it works again...
 
The normal scenario is that, when the VPN client is closed (not uninstalled), the connection to the internet gets blocked... randomly and is impossible to reverse... The only way is to close the firewall and restart it... then it works for a period of time and then blocks again...
 
Anyone got a reason for this?? I am walking in the dark here...
I have no or little experience with VPN clients... I have no idea what they do to the system... Except that they have a service running... and even if that service is closed it still causes these problems...
 
Well, any suggestions is welcome...
 
/Helshad