Common error messages

Microsoft Office Outlook Web Access uses Hypertext Transfer Protocol (HTTP) to display Microsoft Exchange mailbox information in a Web browser. The following are explanations for some common HTTP error messages that may occur while you are using Outlook Web Access.

Error	Description
400 Bad Request	A request from your browser, such as to open a folder or view a message, was incorrect. This can happen if the connection with your Exchange server was interrupted. Try the request again.
401 Unauthorized	You don't have permission to access a particular item or folder. The owner or administrator of the item or folder must grant your account the appropriate permission. Contact an administrator for more information. You may also see this error message if you typed your password incorrectly.
403 Forbidden	You're not allowed to perform this action. Contact an administrator if you think it is an action you should be allowed to perform.
404 Not Found	The item or folder you're trying to access has been moved or deleted. Refresh your browser by clicking Check for New Messages on the main toolbar. You may also see this message if you're trying to access a folder that you don't have sufficient permission to view.
500 Server Error	There has been a failure in the Internet Information Services (IIS) on your Exchange server. Contact an administrator immediately.
500 Internal Server Error	Your Exchange server can't process your request. This can be due to a number of server configurations. You will also receive this error when you try to forward a public folder item on a network that contains Microsoft Exchange Server 2003 servers and earlier versions of Exchange Server. Contact your server administrator.
502 Bad Gateway	Copying items between servers, or between public folders and your default Exchange folders, isn't allowed.
503 Service Unavailable	The Exchange components required by Outlook Web Access aren't running on the server you have connected to. Contact your administrator for an updated Web address.