hi
avast i.s 5.0.462 firewall do not let my vpn to connection to
its server .
what can i do? in Iran most of websites are filtered by government
firewall and we need vpn or proxy to access internet .
sorry dude I wish I could help but I unfortunately have no knowledge at all about VPNs. Never used one but I understand the need for you (following #iranelection on Twitter), and I hope someone here can help, preferably a dev from Avast as they must be the ones to know what should be set in this firewall to allow VPN to run. Good luck 
Use tor network and its proxy to access.
when Iran government wants
it blocks all proxy’s like —> tor–easy hide ip --ultra surf etc ets
we still need a vpn
i like perform avast to use vpn