I can't access my server after 11.5 upgrade

[mavera2]

I updated my Plesk from 11 to 11.5.
Before the update I was reaching my server like this:
https://1.2.3.4:8444
where "1.2.3.4" is my server IP.
Now I can't access my Plesk server.
But when I go to http://1.2.3.4 I can see default Plesk page.

I also can reach my server from Putty with this IP.
I restarted "psa"
But I can't reach Plesk from browser.

 

[InderS]

Try to stop iptbales on your server and check again your plesk panel through browser.

 

[Nikolay.]

Er... Use https://1.2.3.4:8443 or http://1.2.3.4:8880

 

[mavera2]

Er... Use https://1.2.3.4:8443 or http://1.2.3.4:8880

Changing 8444 to 8443 solved the issue.
I updated from Plesk 11.0 to Plesk 11.5
What caused this error ?