nfs problem

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http://www.linuxquestions.org – dear All me using redhat on server machine and open suse on client machine.i have installed nfs server and and it is running properly but when i want to mount shares from my client machine it gives the following error. "mount.nfs: mount to NFS server '' failed: System Error: No route to host" both systems ping each other and firewall is also disabled. another problem is when i remotely access from my server machine to client machine it gives the following error ssh:connect to host port 22:connection refused what can be the problem? (HowTos)