9. Common Problems and Troubleshooting NIS

Here are some common problems reported by various users:

1. The libraries for 4.5.19 are broken. NIS won't work with it.
2. If you upgrade the libraries from 4.5.19 to 4.5.24 then the su command breaks. You need to get the su command from the slackware 1.2.0 distribution. Incidentally that's where you can get the updated libraries.
3. You could run into trouble with NIS and DNS on the same machine. My DNS server occasionally will not bring up NIS. Haven't yet tracked down why.
4. When a NIS server goes down and comes up again ypbind starts complaining with messages like:

            yp_match: clnt_call:
                        RPC: Unable to receive; errno = Connection refused
           
   

   and logins are refused for those who are registered in the NIS database. Try to login as root and if you succeed, then kill ypbind and start it up again.