Usually something like maybe active directory (or whatever) is in charge of keeping domain nameservers in sync. Yours seem to be out of sync. This is not default behavior.

the /etc/resolv file should have at least three entries like this

Code:

domain mydomain.com

nameserver 10.1.2.3
nameserver 10.2.2.2

The first name server is tried before the second one. I listed IP's in my example which is not always the best practice.

The Solaris box needs to look like the above - check it out. You also need to find out who/what is responsible for domain nameserver continuity. And get them back in sync. I am assuming the Solaris box is in the same world as is the linux box, and not behind a router or some firewall.