I am having intermittent problems authenticating users to CIFS shares on Netware 6.5sp6. I have a 3 node cluster with several NSS volumes being shared out via NCP, AFP and CIFS. We have introduced a few new OES2-L servers into the environment and I was cautioned to bring our NW servers up to edir8.7.3.10b and SS206 in an effort to keep everything happy, which I have done on all servers that hold a replica.

The symptom is that the Windows workstation will lose connection to the CIFS share and attempts to remap the drive result in the Windows login box pop up and won't accept any credentials. If I fail the resource over to a different NW server (it's a 3 node cluster) then it works OK. I then reboot the original problem server and fail it back and it's OK. OK for a while that is. Today it's happened twice on two different CIFS shares.

Below is a DSTrace of what I see for the user gradmin when this IS working:
15:19:27 8F873040 NMAS: 27: Create NMAS Session
15:19:27 8F873040 NMAS: 27: CheckIfLocalUser: client supplied user DN gradmin.serviceaccts.GRP
15:19:27 8F873040 NMAS: 27: CheckIfLocalUser: checking actual user DN CN=gradmin.OU=ServiceAccts.O=GRP
15:19:27 8F873040 NMAS: 27: Create thread request
15:19:27 8F873040 NMAS: 27: Using thread 0x91dcd2c0
15:19:27 8F873040 NMAS: 27: Server thread started
15:19:27 8F873040 NMAS: 27: NMAS_CanDo StartClientSession 0
15:19:27 8F873040 NMAS: 27: ClientPut: message size=8 queue Size 0
15:19:27 8F873040 NMAS: 27: ClientPut: message size=7 queue Size 8
15:19:27 8F873040 NMAS: 27: NMAS_CanDo sendMessage 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=8 queue Size 0
15:19:27 92CAA500 NMAS: 27: Pool thread 0x91dcd2c0 awake with new work
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=8 queue size 15
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=7 queue size 7
15:19:27 92CAA500 NMAS: 27: CanDo
15:19:27 92CAA500 NMAS: 27: No client network address
15:19:27 92CAA500 NMAS: 27: Selected requested login sequence == "Windows Native File Access"
15:19:27 92CAA500 NMAS: 27: Login Method 0x00000022
15:19:27 92CAA500 NMAS: 27: MAF_Begin LSM 0x00000022
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=8 queue size 0
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=5 queue size 8
15:19:27 92CAA500 NMAS: 27: MAF_Read LSM 0x00000022
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=8 queue size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=5 queue Size 5
15:19:27 8F873040 NMAS: 27: NMAS_CanDo getMessage 0
15:19:27 8F873040 NMAS: 27: NMAS_CanDo disassembleDoPacket 0
15:19:27 8F873040 NMAS: 27: MAF_Begin LCM 0x00000000
15:19:27 8F873040 NMAS: 27: MAF_Write LCM 0x00000000
15:19:27 8F873040 NMAS: 27: ClientPut: message size=8 queue Size 0
15:19:27 8F873040 NMAS: 27: ClientPut: message size=2449 queue Size 8
15:19:27 8F873040 NMAS: 27: MAF_Read LCM 0x00000000
15:19:27 8F873040 NMAS: 27: ClientGet: message size=8 queue Size 0
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=2449 queue size 2449
15:19:27 92CAA500 NMAS: 27: MAF_Write LSM 0x00000022
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=8 queue size 0
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=2449 queue size 8
15:19:27 92CAA500 NMAS: 27: MAF_Read LSM 0x00000022
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=8 queue size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=2449 queue Size 2449
15:19:27 8F873040 NMAS: 27: MAF_Write LCM 0x00000000
15:19:27 8F873040 NMAS: 27: ClientPut: message size=8 queue Size 0
15:19:27 8F873040 NMAS: 27: ClientPut: message size=2449 queue Size 8
15:19:27 8F873040 NMAS: 27: MAF_Read LCM 0x00000000
15:19:27 8F873040 NMAS: 27: ClientGet: message size=8 queue Size 0
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=2449 queue size 2449
15:19:27 92CAA500 NMAS: 27: MAF_Write LSM 0x00000022
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=8 queue size 0
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=2449 queue size 8
15:19:27 92CAA500 NMAS: 27: MAF_End LSM 0x00000022 successful
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=8 queue size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=2449 queue Size 2449
15:19:27 8F873040 NMAS: 27: MAF_End LCM 0x00000000
15:19:27 8F873040 NMAS: 27: ClientPut: message size=8 queue Size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=8 queue Size 0
15:19:27 92CAA500 NMAS: 27: WhatNext
15:19:27 92CAA500 NMAS: 27: Successful login
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=8 queue size 0
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=4 queue size 8
15:19:27 92CAA500 NMAS: 27: ServerGet: message size=8 queue size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=4 queue Size 4
15:19:27 8F873040 NMAS: 27: ClientPut: message size=8 queue Size 0
15:19:27 8F873040 NMAS: 27: ClientGet: message size=8 queue Size 0
15:19:27 92CAA500 NMAS: 27: ServerPut: message size=8 queue size 0
15:19:27 92CAA500 NMAS: 27: Server thread exited
15:19:27 92CAA500 NMAS: 27: Pool thread 0x91dcd2c0 work complete
15:19:27 8F873040 NMAS: 27: NMAS_SetIdentity was successful
15:19:27 8F873040 Auth: 1 DSAFinishAuthentication.
15:19:27 8F873040 Auth: 2 DSAFinishAuthentication.
15:19:27 8F873040 Auth: 3 DSAFinishAuthentication.
15:19:27 8F873040 Auth: 1 GlobalGetSEV.
15:19:27 8F873040 Auth: 4 GlobalGetSEV succeeded.
15:19:27 8F873040 Auth: [0000a4bc] <.gradmin.ServiceAccts.GRP.GRPTREE.> Authenticated. Error success, conn: 184.
15:19:27 8F873040 Auth: 4 DSAFinishAuthentication.


Below is when it is NOT workingfor gradmin:
15:16:33 A0C68360 FFFFFFFF NMAS: 50: CheckIfLocalUser: client supplied user DN gradmin.serviceaccts.GRP
15:16:33 A0C68360 FFFFFFFF NMAS: 50: CheckIfLocalUser: checking actual user DN CN=gradmin.OU=ServiceAccts.O=GRP
15:16:33 A0C68360 FFFFFFFF NMAS: 50: Create thread request
15:16:33 A0C68360 FFFFFFFF NMAS: 50: Using thread 0x92286a40
15:16:33 A0C68360 FFFFFFFF NMAS: 50: Server thread started
15:16:33 A0C68360 FFFFFFFF NMAS: 50: NMAS_CanDo StartClientSession 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientPut: message size=8 queue Size 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientPut: message size=7 queue Size 8
15:16:33 A0C68360 FFFFFFFF NMAS: 50: NMAS_CanDo sendMessage 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientGet: message size=8 queue Size 0
15:16:33 A008D320 FFFFFFFF NMAS: 50: Pool thread 0x92286a40 awake with new work
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerGet: message size=8 queue size 15
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerGet: message size=7 queue size 7
15:16:33 A008D320 FFFFFFFF NMAS: 50: CanDo
15:16:33 A008D320 FFFFFFFF NMAS: 50: No client network address
15:16:33 A008D320 FFFFFFFF NMAS: 50: Selected requested login sequence == "Windows Native File Access"
15:16:33 A008D320 FFFFFFFF NMAS: 50: Login Method 0x00000022
15:16:33 A008D320 FFFFFFFF NMAS: 50: MAF_Begin LSM 0x00000022
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerPut: message size=8 queue size 0
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerPut: message size=5 queue size 8
15:16:33 A008D320 FFFFFFFF NMAS: 50: MAF_Read LSM 0x00000022
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerGet: message size=8 queue size 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientGet: message size=5 queue Size 5
15:16:33 A0C68360 FFFFFFFF NMAS: 50: NMAS_CanDo getMessage 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: NMAS_CanDo disassembleDoPacket 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: MAF_Begin LCM 0x00000000
15:16:33 A0C68360 FFFFFFFF NMAS: 50: MAF_Write LCM 0x00000000
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientPut: message size=8 queue Size 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientPut: message size=2449 queue Size 8
15:16:33 A0C68360 FFFFFFFF NMAS: 50: MAF_Read LCM 0x00000000
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientGet: message size=8 queue Size 0
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerGet: message size=2449 queue size 2449
15:16:33 A008D320 FFFFFFFF NMAS: 50: MAF_Write LSM 0x00000022
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerPut: message size=8 queue size 0
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerPut: message size=2449 queue size 8
15:16:33 A008D320 FFFFFFFF NMAS: 50: MAF_Read LSM 0x00000022
15:16:33 A008D320 FFFFFFFF NMAS: 50: ServerGet: message size=8 queue size 0
15:16:33 A0C68360 FFFFFFFF NMAS: 50: ClientGet: message size=2449 queue Size 2449
15:16:55 957425C0 0000A142 Auth: 1 GlobalGetSEV.
15:16:55 957425C0 0000A142 Auth: 4 GlobalGetSEV succeeded.
15:16:58 95744040 0000A142 Auth: 1 GlobalGetSEV.
15:16:58 95744040 0000A142 Auth: 4 GlobalGetSEV succeeded.
15:16:59 95743600 0000A142 Auth: 1 GlobalGetSEV.
15:16:59 95743600 0000A142 Auth: 4 GlobalGetSEV succeeded.
15:17:07 A08624C0 FF000001 Auth: 1 DSAFinishAuthentication.
15:17:07 A08624C0 FF000001 Auth: 2 DSAFinishAuthentication.
15:17:07 A08624C0 FF000001 Auth: 3 DSAFinishAuthentication.
15:17:07 A08624C0 FF000001 Auth: 1 GlobalGetSEV.
15:17:07 A08624C0 FF000001 Auth: 4 GlobalGetSEV succeeded.
15:17:07 A08624C0 00008259 Auth: [00008259] <.Mgaynor.SYSTEMS.GrandRapids.GRP.GRPTREE.> Authenticated. Error success, conn: 171.

Note I see a success for mgaynor but never for gradmin.

Any ideas? This actually has become more frequent since I've updated our NW6.5 servers and is affecting production. Thanks for any suggestions.