Resolved Plesk upgrade problem

[Balanca]

Hello,

I'm trying to upgrade Plesk from version 17.5.3 to version 17.8.11 and I get a warning: Unable to connect to some Plesk ports. In log file I can see:
INFO: STEP 22: Checking the availability of Plesk Panel TCP ports...
INFO: Unable to connect to IP address 2a02:a207:2017:6596::1 on Plesk Panel non-secure HTTP port 8880: Connection refused
INFO: Unable to connect to IP address 2a02:a207:2017:6596::1 on Plesk Panel secure HTTPS port 8443: Connection refused

I have tried several things: open ports in firewall, disabled firewall, disabled ipv6 - but then some other warning comes up...

I don't know if it's safe to upgrade Plesk with this issues.

Any help would be appreciated.

 

[IgorG]

Try to perform upgrade in CLI. Just run

# plesk installer

and follow the menu.

 

[Balanca]

No luck, the same warning was generated in pre-upgrade check :/

 

[Balanca]

I don't understand why port 8880 is open to my ipv4 and not to my ipv6:
# ip6tables -S
-A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8880 -j ACCEPT

 

[Bonsai78]

With iptables the order of the commands is VERY important. Check ALL rules and the order of them!

A closed port can have two resons:
1) Firewall blocks it
2) Nothing is listening on this port
Linux: Find Out Which Process Is Listening Upon a Port - nixCraft

 

[Balanca]

Thanks for the answer.

So on port 80 are listening ipv4 and ipv6:
# netstat -tulpn | grep :80
tcp 0 0 5.189.125.128:80 0.0.0.0:* LISTEN 1918/nginx: master
tcp6 0 0 2a02:c207:5012:6596::80 :::* LISTEN 1918/nginx: master

But on port 8880 is listening only 0.0.0.0:
# netstat -tulpn | grep :8880
tcp 0 0 0.0.0.0:8880 0.0.0.0:* LISTEN 23558/sw-cp-server:

So if I am correct nginx should listen on port 8880 also. I'm not very familiar with this area. Does anybody know how to get this done?

 

[Balanca]

For anyone also having this problem...

Service sw-cp-server was not listenig on tcp6.
I had to manually create file /etc/sw-cp-server/conf.d/ipv6_ports.inc with following content:
listen [::]:8443 ipv6only=on ssl;
listen [::]:8880 ipv6only=on;

And then restart sw-cp-server service.
Upgrade then went ok without any warnings.

 

[manos]

lifesaver answer