POST requests are being dropped by AppFirewall when POST Body limit is set to 4 GB.
Article ID: CTX236467
Updated On:
Description
POST Body limit is configured more than 2 GB under AppFirewall Profile settings.
AppFirewall drops the POST request received from Client and sends TCP Zero Window. This can be confirmed through NetScaler Trace.
Resolution
Issue is fixed in 12.0 build 58.
NOTE: After upgrading to 12.0 build 58, the POST body limit can be set back to the maximum value of 4 GB
NOTE: After upgrading to 12.0 build 58, the POST body limit can be set back to the maximum value of 4 GB
Problem Cause
The leading TCP window size is rounded off when the post body limit is set to 4294967295(2^32-1). Hence, AppFirewall is dropping the HTML Form post contents coming from Client machine
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