NIS Issue,Client node went out of Domain

[Lakshmana]

Since I spoke many things regarding NIS and NFS,but today i faced the issue in the NIS client machine.
I have given NIS domain name in the Master Server and the slave server ( client) was connected with the Master server.
The slave server is rebooted once but the domain name is not provided in the slave server when i check with the command ypwhich.
Error:ypbind cannot communicate with the master server

I have checked the configuration fully but there is no mistake.When i ping the hostname it is pinging but the slave server is out of domain(eg.test.com)

I have reinstalled the NIS and checked not improvement.
That server has Network Port Issue also.There are 2 NIC cards in that one of the NIC is not workin g.

[scottalanmiller]

Use telnet to test the post to ensure that it is listening for yp requests.