We are using Exchange 2003 with clusterThe exchange will doesn't work frequently POP3 usercan't connect to serverand exchange mode user can't sent and receive mailWe can success to telnet the exchange ports 25 and 110We can fix the problem after failover to another cluster host. But the problem will happen after a period of time.Many Thanks

Do you have latest patches/hotfixes have installed for Exchange and Windows? Check SNP feature hotfixes have been installed to turn of this feature sicne it casues problem for Exchange... http://support.microsoft.com/kb/950224 http://support.microsoft.com/?kbid=948496 After installing these check how server responds... Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

I have installed patch 948496 and disabled SNP features before

Hi,Have you checked the application log,there we may get more informaiton about the issue.Please post the detail event information here.Besides, you can use ExBPA to have a health scan and then check the report.Regards,Xiu

I checked the application log. It show the following error only during the error periodEvent Type:ErrorEvent Source:POP3SVCEvent Category:General Description:An error occurred calling into the Microsoft Exchange Information Store service: the call to EcSetMessageProp failed with error 0x8004010f. For more information, click http://www.microsoft.com/contentredirect.asp.Data:0000: 33 03 19 00 3... Error 0x8004010f occurred while rendering message 0001-00000521e699 for download for user ......i have run the ExBPA before, but it have not show any critical problem.Many thanks,