Article ID: 129192, created on Aug 1, 2016, last review on Aug 1, 2016

  • Applies to:
  • Operations Automation 6.0


Operations Automation is running on Windows with Microsoft SQL as a database engine. Control Panel is loading for a long time or the following error appears when attempting to access all parts of the Control Panel:

Service Unavailable
HTTP Error 503. The service is unavailable.

The following stuck queries can be found in poa.log:

Feb 11 15:16:53 OSSCORE001 : DBG [UI:b09591e5:1845050:1455203812509 RequestProcessor-88059 pau 2123966006]: Executing update: ' UPDATE mlabs_protected_emails SET sync_status =  ? , was_updated =  ? WHERE recipient_id =  ? AND recipient_type =  ? AND sync_status !=  ? AND email NOT IN ( LOWER( ? ) ,  LOWER( ? )  ) ' Parameters: [d, y, 1924393, mbx, d, john.doe@domain.tld, john.doe@domain2.tld] [sqlpid: -1]


The issue is located in MessageLabs service controller, it is reported to the OA maintenance team as POA-100940: "Updating of recipient emails in Message Labs locks another update operations".


Please contact your Account Manager or Pooled Technical Associates team ( to trace the status of POA-100940. As a workaround please restart pem and pau services on the OA Management Node.

Search Words

503 service unavailable

control panel down




control panel inaccessible

panel performance


503 Error


5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 956c448bddc7e1f3585373687602379f 6f1456866eed87488c0f02b298a741c0

Email subscription for changes to this article
Save as PDF