AIX storage node cannot backup data to backup server when manual backup

By default NW, if not aware what is the backup server, will first try to contact nsrd on localhost. Some programs (like nwadmin and nsrwatch) will look for nsrd across the same subnet as machine from which you will lunch the request. I believe if you had nsrexecd running with -s server name than you should not see that. Same applies to /nsr/res/servers (however, this was case with some versions and then it was broken in some others so I have no idea what is the current status with that, but I assume it should work - not that you need to restart nsrexecd after /nsr/res/servers change for changes to take effect).

also, with the servers file, if there are more than one system listed within the file, it will also cause this. We found if we just have the networker servers name and no other within the file, it functions properly....

at lot of systems seem to have been update with 2 or 3 networker server names, or themselves, sometime due to a client changing networker servers etc.

I have edited rc.nsr , add "-s bckserver" after nsrexecd, and restart the networker session.but this problem replay when I run "save /etc".
I must run "save -s bckserver"
when I run mminfo -c cltname I get the same error.

last time i have seen this (needing to hardcode server to nsrexecd etc) was back in v5.#.# days, not in v6, so am surprised to see it in v7.

does you /nsr/res/servers file have just the following
----------------------------------------------------------------
# NetWorker uses the contents of this file to control which servers have the
# right to request a program, such as save, to be executed on this client.
#
# After changing this file, you must restart the NetWorker services
# for your changes to take effect.
bckserver.mynetwork.com
bckserver
-----------------------------------------------------------------

have you stopped networker, cleared out the /nsr/tmp area on the storage node ?

altho to be honest, best practice would have you ensure the "-s nsrsvr" is used with any networker command. mminfo expects it, save should function without it.

For mminfo, if run from client, you will have to use -s switch always.