Hi, A single user cannot able to access OWA, getting an error Http 500 internal server error He is the only one user getting the error in my organisation , I am using exchange 2003 server Could you guide me what needs to check? Thanks Mohammed eliyas

Try changing his mailbox alias. Put a "9" on the end of it or something like that.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Even after changing the alias, the result is same "Http 500 internal server error"

Is there anything in the event log?Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi These KB explain how to troubleshoot IIS . http://support.microsoft.com/kb/829167 http://support.microsoft.com/kb/871013 According to your saying, it seems to be client error. Can this user connect to exchange by outlook? Can you check the user permission by ADUC?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, From your description, I understand that there is only one user had this kind of issue. So most users could access OWA without any issue. It proved that the IIS settings are correct. If not, all the users will fail to logon the OWA. According to the error message on the webpage HTTP 500 Internal Server Error, the issue could be related to the affected user's mailbox. I suggest that the affecte user could use another PC to verify whether the issue could be reproduced or not. If the issue could be reproduced, I suggest that you could ldifde command to export the normal user and affected user's properties to compare the settings. For more detailed infomration about ldifde command, I would like to share one link for your reference: Title: Using LDIFDE to import and export directory objects to Active Directory URL: http://support.microsoft.com/kb/237677 I hope the information provided above is helpful to you. Thx, Chen