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NFS fails to start, "Cannot register service"
Problem:
During attempted startup of the NFS daemon (knfsd) the following error message appears several times: Cannot register service: RPC: Unable to receive; errno = Connection refused
 
Solution:
NFS attempts to register it's services with the portmapper, but the portmapper is refusing connections.

1. Restart the portmap service using
/etc/rc.d/init.d/portmap restart
2. Restart the NFS daemon using
/etc/rc.d/init.d/nfs restart

 
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