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HTTP traffic is blocked by Application Control with "HTTP parsing error occurred, blocking request (as configured in engine settings)" log
Symptoms
  • SmartView Tracker log from Application Control shows that HTTP traffic was blocked:
    "HTTP parsing error occurred, blocking request (as configured in engine settings)"
Cause

Starting in R77.30, the HTTP inspection was improved to be stricter.

IPS protection "Non Compliant HTTP" has detected either an HTTP Response that does not correspond to any HTTP Request, or redundant CR/LF characters (\r\n) at the end of the previous valid HTTP Response.

Such a scenario usually occurs when a proxy server sends a non-compliant HTTP redirect response: the HTTP response has some HTTP data, but either does not have the "Content-Length" header, or the value in the "Content-Length" header is 0 (zero).


Solution
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