Summary
A website that is behind an NAM system cannot be accessed due to an error. The error message indicates that the request header field size has exceeded the server limit when attempting to navigate from one website to another. The error is triggered when the size of the cookie exceeds around 8k.

Products
Access Manager (NAM)

Environment
NAM Appliance 4.3.1.1-57

Situation
A website that is behind an NAM system cannot be accessed due to an error that says "Bad Request" Your browser sent a request that this server could not understand size of request header field exceeds server limit.
The error message indicates that the request header field size has exceeded the server limit when attempting to navigate from one website to another. The error is triggered when the size of the cookie exceeds around 8k.

Cause
The error occurs when the cookie size exceeds approximately 8k.

Resolution
In this instance, please follow these procedures to remedy the problem.

Please note that this must be applied to all of your IDPs.

1. Verify server.xml for Admin Console shows the correct maxHttpHeaderSize

Use this path to access the server.xml file /opt/novell/nam/mag/conf/server.xml and at the bottom locate maxHttpHeaderSize and increase it to 65536.

2. Verify that in AG - Advanced Options this has been added: LimitRequestFieldSize 65536

3.Update or restart your IDP's

Knowledge Base Article Link

URL Name
KM000016999