Plesk shows login screen very often

[kpanayotis]

Version: Parallels Plesk v12.0.18_build1200140610.21 os_Ubuntu 14.04

After a few minutes or after specific actions Plesk shows the login screen without obvious reason. For example when I am trying to modify a file online and try to save it for the second time it always shows the login screen.
Also, when I enter the credentials I can see that the previous session(s) remain open. I have configured the session idle time to 1000 minutes, although I do not remain idle for 300 min anyway.
I have no clue where to look for a solution, since I am completely new to this.

Panayotis

 

[IgorG]

Can you reproduce this strange behaviour in other browser?

 

[kpanayotis]

It is the same on Firefox 38.0.5 and Chrome 43.0.2357.124 m. I do not have IE on my system. I'll look into it more thoroughly and provide more info.