After publishing Exchange Server 2010 SP1 (particularly Outlook Anywhere), you may have the following event logged on the Application event log in your UAG server:

Log Name:      Application

Source:        Microsoft Forefront UAG

Date:          21/11/2010 20:24:14

Event ID:      24

Task Category: None

Level:         Warning

Keywords:      Classic

User:          N/A

Computer:     <UAG Server>

Description:

The request from user <user name> at source IP address <IP address> to trunk portal; Secure=1 failed because the request was unable to reply to an HTTP 401 request from application Outlook Anywhere – EWS of type EWS. The session ID is A8ADD7CE-387C-470E-A38F-39D70F608CA8.

 

To solve this, open the Outlook Anywhere EWS application from your trunk:

image

Go to the Web Servers tab and change the default paths which were automatically defined:

  • /OAB/ >> /OAB.*
  • /EWS/ >> /EWS.*
  • /UnifiedMessaging/ >> /UnifiedMessaging.*