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Yesterday, we were frequently failing the SAM CE tests, although non-OPS VO jobs seemed to be OK. After following the discussions in the news groups, I reached the conclusion that the problem was due to the lack of sgm and prd accounts. Therefore I added lines of the form 50601:opssgm001:1932:ops:ops:sgm: 51301:opsprd001:1932:ops:ops:prd: to users.conf for each VO, and then ran configure_node on the CE and all WNs. Now we are failing ALL our SAM CE tests. I reversed the change by deleting the new accounts from user.conf and running configure_node on the CE and WNs again, but we are still failing ALL the tests. I don't see anything wrong in the globus-gatekeeper logs, I can su to ops001 and prove that ssh between the WN nodes is OK, and I can submit jobs internally with qsub. Any ideas anyone on how to debug this? Thanks in advance Dave