What does "not a registered client" mean?

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A. Wan-hsuan Wu wwu@APPLIEDTHEORY.COM has a very good method to solve this problem: Do you have a separate interface name assigned for the private IP for this client other than "regwww.domain.com.sg"? Or is this the hostname that corresponds to the private IP? If you would let me know what's in the client's /etc/nodename (or output of 'hostname') and what's in the client's /etc/hosts (only the portions about this client), I might be able to pinpoint to the cause. Basically, if the client has a primary interface name (like regwww.domain.com.sg) and a backup interface name (like regwww-bkup.domain.com.sg), this is how you would set up the client on Networker:

1. Set up the client using the the primary name (regwww.domain.com.sg).
2. Add all interface names that this client has (as seen in the client's /etc/hosts) to the Aliases field in the Client Setup.
3. In the View Details of Client Setup, enter the backup interface name of the server (for example, serverx-bkup.xxx.xxx) to the Server Network Interface field.
4. If you could not do reverse lookup on the client backup interface name from your backup server, then add the client's backup interface name (e.g. regwww-bkup.domain.com.sg) to the server's /etc/hosts.

Other solutions that Christopher Ho reported in his post:

Kai Valjakka <kai.valjakka@allegro.fi> talked about old clients, which could be taking up a license unknowingly. (not in this case) Jeffrey S. Jewett <spider@umd5.umd.edu>, Alain BADER <abader@scasicomp.com> said to include the FQDN of the client in the hosts file, and to add it into the client resource. Thawipong <anuchac@ksc11.th.com> said to check the /etc/hosts on both the client and server. Stan Horwitz <stan@ASTRO.OCIS.TEMPLE.EDU> mentioned that the operating system should be the same, otherwise a ClientPak would be required. (not in this case) Matthew Russo <mrusso@CCCONLINE.NET> postulated that "Sounds like a name alias problem to me. You need to edit the client resource and add all the names this client is known by in the alias field." (YES!!!!!)