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What's the output of rpcinfo -p server_ip (issued from the client)? It'll give you the idea about the ports the server is using. Make sure that you are using the same ports for rpc services. What distro are you using?
I'm mostly a n00b, but I did some nfs stuff the other day and my nfs server start script was called nfs-kernel-server (and there was nfs-common). This probably won't help, but just make sure you did indeed restart the right thing.
The other thing, make sure your node can connect to the Internet and resolve domain names (you can just type "nslookup google.com" at the command prompt and make sure it returns an answer).
portmap and mountd both use TCP Wapppers. If you have a /etc/hosts.allow or /etc/hosts.deny, check the entries in both. If you have a firewall enabled, you need to add rules for portmap (111), 2049 and the various NFS services.