gray X-screen after work delay

[Eugene Stolbikov]

Hello All,

I have one issue with my vnc.

I run vncserver on SUN Solaris station and vncviewer on Linux (server 
and viewer have the same versions 4.1.1).
If I do not work with vncviewer screen ~15 min, I get gray X screen.
What is the cause of this problem? Screensaver? Standby mode? Manually 
run screensaver do not damage viewer.
Viewer restarting doesn't solve the problem.
Any ideas?

Thank you in advance.

<OzzY>