Cause

An example of a message from SunOS:

Jan  5 14:45:37 host1 portmap[86]: connect from 158.175.36.135 to 
callit(ypserv): request from unauthorized host

• request from unprivileged port

• request from non-local host

• request not forwarded

In the Solaris operating environment, the error might look similar to the following:

Jan  5 14:45:37 host1 rpcbind[86]: refused connect from 158.175.36.135 
to callit(ypserv)

In all cases, the ypserv part of the message might actually be any RPC service, such as mount or nfs or status.