file descriptors

[Jozef Gniadek]

Hi folks
        Maybe this is out of topic. On sun with solaris 2.5.1 are running mail 
server and web server, I got error msg, something like ' out of file descriptors,
too many open files'......
What I should do?, how I may to increase file descriptors?, if this is posible...

Any ideas......

Jozef