Looks like client has a problem resolving its name in RAP database on server. Is that Domino in cluster perhaps?

What is RAP monitor (if you are talking about feature to monitor changes in RAP database I have no idea how that would be related)?

Anyway, if it fails from client it sounds like either an issue with module configuration or something else global. Do you have file system backup for that client and does it work correctly? If yes, can you say how module is configured and also how the client is configured?

We don't use cluster.
Until now we use a standard backup after stopping notes service without a problem.
So I don't think, it's name resolving.

We don't use RAP Monitor

We have file system backup which works correctly.
to create the new client, i have made a copy of the "normal" client and only add the fields:

save set: "NOTES:";
backup command: nsrnotesv.exe;
application information: \
"MYARGS=-F C:\\exploit\\bao\\logs\\backup_online.log";

We have two others clients which work that way.
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Besides, when I launch "Networker User for Lotus" GUI,
I receive those messages 'Searching for a Networker server' and 'You are not a client of any Networker User' .
With the 'Networker Administrator' GUI, there is no problem .
I don't understand why .

Because you need to feed -s parameter to the client program. Just edit the shortcut and add -s server_name.

As for LNW, try to reinstall module and on server side delete client resource for Notes backup, restart NW and create it again - might be some strange corruption within resources. Perhaps this is too many mights and maybes so you better involve support on this one.

In fact, we had a pb with the long client name. I thought the problem came from the server name. After the correction ( DNS problem), the NML user GUI works correctly.
Its confusing, because NML GUI warns about the server.