3CX STUN servers are reporting our FQDN IP address incorrectly

[databim]

Hello All,

in the 3CX network settings, "Static IP" is selected, and the fields related to the STUN server are disabled. Despite this and even though the STUN servers should not be tracking our IP address the system periodically reports our FQDN IP address as 74.248.19.11. As a result, our remote extensions are unable to access the PBX or receive calls. While restarting the 3CX services temporarily resolves the issue and ensures the correct (actual) IP address is reported but the problem recurs after a while. The firewall test completes successfully, showing no issues. Here is what we have tried so far:

• We have updated it to Version 20.0 Update 10 (Build 1785 Release - AI 1.6.91). We experienced the same issue in the previous version as well.
• We migrated the system from a Windows server to a Linux server. (in case it has to do with the operating system)
• We enabled "KEEPALIVEENABLED" in the 3CX parameters and set the interval to 30 seconds.
• We set the UDP timeout on the router to 1800 seconds.
• To test our current internet connection, we moved the server to a different location and used a different IP address; however, the same issue persisted, and the system again reported the IP address as 74.248.19.11.

To whom does the IP address 74.248.19.11 belong? Why are we experiencing this issue? I would appreciate your suggestions.

 

[bitn2]

This can really only happen if you have another system running with the same FQDN.

 

[DimitrisL_3CX]

Hello @databim

As @bitn2 mentioned, this happens when two installations have the same FQDN.
So it is either a previous installation that it is still running. For example the IP provided points to an Azure installation.
Or you have a Failover that it is not set to Passive mode and all services are up and running.

 

[databim]

Thanks for your response, Jan. I considered this possibility as well, but that is definitely not the case. It is installed only on our own server and in one single location.

 

[Alphabetic]

That IP belongs to Microsoft so are you sure you didnt set up a VM or something in the past? Replication?

 

[bitn2]

Thanks for your response, Jan. I considered this possibility as well, but that is definitely not the case. It is installed only on our own server and in one single location.

In that case, you should contact 3CX so they can check whether another instance is running under that IP address.

 

[DimitrisL_3CX]

Please note that we have already checked for any other instance running on the specific IP, but found none.

 

[databim]

Please note that we have already checked for any other instance running on the specific IP, but found none.

Dimitri, where do you think the problem lies in this situation? Is it with our server and settings, or with the 3CX servers?