Solved 3CX firewall check error

[andrey.andreev]

When I try to run a firewall Check I am getting the following message:

Value cannot be null. (Parameter 'address')

See the screenshot attached.

Also as I am behind dynamic IP address the STUN servers are not getting resolved. Error below:

TUN server stun3.3cx.com:3478 could not be reached (host name is not resolved). It could be that the STUN server you are using is down or a network problem is preventing STUN resolutions. This might cause problems if you use VoIP Providers.

When I run nslooup stun3.3cx.com on the host machine it resolves properly.

Double-checked the setup on the firewall (SonicWall) all seems OK.

I am out of ideas, any help will be much appreciated.

 

[jcostlow]

Does this 3CX server have multiple NICs? Does your SonicWall have any security services enabled (geo ip filter, botnet filter, gateway AV)

I haven't seen that error but asked if it has multiple NICs in case it is using the wrong NIC as the default internet facing NIC.

 

[andrey.andreev]

No multiple NIC.

Disabled botnet filter, gateway AV - same story.

I was advised by our account manager to reinstall the 3CX.

On it now.

 

[andrey.andreev]

Update - everything is OK after reinstalling the 3CX.

One more time great support / tip from from our reseller M.S Networx Solution Ltd