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It is not issue with firewall, because even I disable one ISP provider and firewall check would be passed, issue is the same.
I'm not saying that the SD-WAN is the main reason you're unable to access updates. I'm simply pointing out that the firewall shows misconfigurations, such as SD-WAN, Proxy-based setups, etc. In any case, here are my recommendations:
Use 3CX hosting; it's a turnkey solution!
or
Make a backup, create a new VM, and restore your backup. You'll have the latest version.
However, in my opinion, you're just postponing the issue because I’m convinced the root cause lies in a network configuration.
Reconfigure your network according to 3CX's recommendations.
For example, it's not normal that I see a local IP (192.168.76.1) instead of the public IP.
While this might not be the exact cause, it again suggests that there are non-standard configurations.
Avoid manually modifying the 3CX configuration files.
If you're not using IPv6, disable it directly in Linux, although it may not be the exact cause of your issue.
If you follow 3CX procedures, you'll ensure reliability and stability. However, my recommendation remains to host your PBX with 3CX.
