KB43718 - Result code 413 observed in the user access log from the exchange server when using Active Sync

This article outlines a potential reason for seeing HTTP return code 413 in the user access log for a user accessing ActiveSync

Result code 413 is observed in the user access log from the exchange server when accessing emails through Active Sync.

This issue happens when the value of the uploadReadAheadSize is configured as 0 (zero)

Follow the steps below to resolve this issue:

1. Launch Internet Information Services (IIS) Manager
2. Expand the Server category.
3. Expane the Sites category.
4. Expand Default Web Site
5. Click on Microsoft-Server-ActiveSync
6. In the Features section, double click Configuration Editor
7. Under the Section header select: system.webServer > serverRuntime
8. Increase the value for uploadReadAheadSize as shown below.
9. Click Apply to save the changes.  
10. If this does not resolve the issue then please open a Support case with Pulse Secure for additional debugging.