I am configuring a new ubuntu nis client and have all the configuration files exactly the same as existing clients (nsswitch.conf, passwd, group, host.conf, hosts, yp.conf)

The new client returns a dump of the passwd file with a “ypcat passwd” command. ypwhich returns the correct domainname. Ypmatch seems to work as well but the client won't authenticate!!!

NFS is mounted and I can see home directories

The debian server is working fine with existing clients. Does anyone have a suggestion what I should check next??

Could this be an issue with running updates on the new client?? could debian and ubuntu be not getting along.

Do you have a last line in the local /etc/passwd. Otherwise I would also assume it's a missing entry in /etc/nsswitch.conf, but you state that it's identical to the working clients. Anything in the logfiles, either on the client or the server side?