Issue Updates and Upgrades page cannot be opened

[kaho]

In this case i can't open updates and upgrades page for checking additional components. I was follow this way:
Updates and Upgrades page cannot be opened: it just loads continuously. Port 8447 is not filtered

But still doesnt work.

 

[Bitpalast]

I assume that you made sure that
- No hanging or running update/upgrade process is in the process list
- Port 8447 is open on the server
- Your DSL's public IP is not blocked in any rule in the iptables firewall on the server

Please check whether your local DSL router allows traffic through port 8447.