Anyone had firewall problems Windows 2008 64bit

[owend]

We're testing our 3CX on a directly interneted connected server using the windows firewall and are having intermittent problems.

We get some calls working and some calls just dont connect. Completely random. We're done a SIP trace and it looks like large UDP packets are getting blocked. However we've turned off the firewall completely and it still happens.

Even with all extensions logged off, so we can just test the inbound to the 3CX and hear the voicemail...same again, sometimes it connects sometimes not.

ISP has confirmed that they don't do anything with SIP traffic ie block it etc.

anyone else heard of this?

 

[davidbenwell]

We are running Windows 2008 64Bit with no issues, Firewall enabled.

if you disable the fireall (Windows firewall) does it all work ok?

 

[owend]

Same problem if we disable the firewall..

I'm just not that confident that windows does actually disable it fully!

 

[davidbenwell]

can you run the 3CX Firewall Checker and post the output here?

 

[simonff]

I have this problem also, did anyone find a fix?

 

[cow101]

Try going to Setting -- Advanced -- Anti-Hacking and raise the parameters. Also are the calls being made on a local lan.