I'm having the same problem with one-way communication and this 401 error in the clustering area.
My login_log shows:
Code:
xxx.xxx.xxx.xxx - root [07/10/2009:21:10:58 -0000] "GET /scripts2/showversion? HTTP/1.0" FAILED LOGIN whostmgrd: user access hash file is empty
This, I assume, is because when adding a server to the cluster, the reverse relationship is added as well.
I fixed the issue by creating a new Remote Access Key and re-creating the cluster relationships. It seems that there is no RAC by default and the clustering software will create a reverse relationship even though it does not have a key available.
NO MORE ERRORS! Woot!