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Resources on some HTTPS websites get stuck for several minutes
Symptoms
  • While browsing a Microsoft websites (For example: Azure), site will get stuck on a specific resource for several minutes, then show "200 OK" in the network tab on the browser, and finish loading.
  • Issue does not get replicated with each attempt. Sometimes requires a few attempts while browsing the website. (Make sure to clean cache/browsing data on the browser.)
Cause

The client sends data to the Security Gateway. 

The Security Gateway sends a SYN to the server, and waits for the SYN-ACK.

In that time interval, the client will continue sending data to the Security Gateway.

This will trigger CPAS to send another SYN, which on Microsoft servers, might activate a protection for double SYN without RST. This causes the connection to freeze. 


Solution
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