3CX failed to establish a TCP connection to activation.3cx.com.

[darnell]

Hi

I have an install that is on V15.5.10244.4 and have the error message 3CX failed to establish a TCP connection to activation.3cx.com. which means I can't upgrade because it thinks there is no valid maintenace.

I read somewhere that I need to manually upgrade.

This is on a Linux install, I read in another post that I can do this with SSH, and ran:
apt-get update
apt-get upgrade

but it is still on the same version.

How can I upgrade it?

 

[cobaltit]

Here is the reference post on how to upgrade:

https://www.3cx.com/blog/news/pbx-upgrade-update-6/

But since you tried that and it didn't work, are you on Debian 8 still?