HI ALL I have active /passive exchange cluster initially my cluster on node1 and recently i change to passive node (node2) now my cluster on node2. and i have lot of disabled users in my AD when my cluster on node1 i am not getting any NDRs /event ID 9548 when i moved cluster to node2 i am getting lots of NDRs /event ID 9548 this basically for diasbled users i am getting this warnings. i checked MS artical for this error+++++++++++++++ http://support.microsoft.com/kb/555410 Event ID 9548. Disabled user /O=Organization/OU=SiteName/CN=RECIPIENTS/CN=User_Name does not have a master account SID (msExchMasterAccountSid). Please use Active Directory MMC to set an active account as this user's master account. and i done as suggested in this articale but it did`t work for me still i am getting so many NDRs /event ID 9548 and what is my futher steps to resolve this issue any suggestion please share with to resolve this issue. Thanks Kumar.

Hi Kumar, I understand that you have lots of disabled users in the Active Directory. Recently, after changing node 2 on the cluster, lots of NDRs and event ID 9548 logs were received. You have tried solutions on KB article (ID 555410), but it still exists. If I have misunderstood, please feel free to correct me. After checking the article 555410, it suggests us two other links as below. http://support.microsoft.com/kb/278966 http://www.msexchange.org/articles/NoMAS-Tool.html Currently, I am not sure whether you have tried them all, so please clarify below questions about the steps you tried. 1. Did you follow steps from 1 to 4 for all the disabled users in your AD as the first link indicates? 2. Have you read the second link about NoMAS tool? In my opinion, its time-consuming to resolve it without a tool or update if there are lots of disabled users in the active directory. According to my research, regarding the MSExchangeIS event 9548, a hotfix is available to modify the way that Exchange Server 2003 handles a disabled Active Directory user account that is associated with an Exchange Server 2003 mailbox. please refer to below two KB articles for more information. For Exchange 2003 SP1 http://support.microsoft.com/default.aspx?scid=kb;en-us;903158 For Exchange 2003 SP2 http://support.microsoft.com/default.aspx?scid=kb;en-us;916783 It seems that you need submit a request to Microsoft Online Customer Services to obtain the hotfix. Regards, Jason

HI Jason, I am sorry for Delay in reply as you mentioned in you mail Idone all steps mention in http://support.microsoft.com/kb/278966 and i have not tried thishttp://www.msexchange.org/articles/NoMAS-Tool.html I done all users manually but no luck and I found yester day i am getting this event ids for non disabled usres also for few only its so strange I am not able to figure out where the problem is i need your further commnets on this. Thanks Kumar.

Hi Kumar, I understand that the event ID 9548 even appears on non-disabled users. Based on the situation, I highly suggest you apply the hotfix as I mentioned before. You may need submit a request to Microsoft Online Customer Services to obtain the hotfix. As far as I understanding, you wouldnt be charged for the update/hotfix due to support policy. http://go.microsoft.com/?linkid=6294451 Regard, Jason