Switch to the Burp Project options | Misc tab. Note the Burp Collaborator Server section. You have options available for using a private Burp Collaborator server, which you would set up, or you may use the publicly internet-accessible one made available by PortSwigger. For this recipe, we will use the public one:
Check the box labeled Poll over unencrypted HTTP and click the Run health check… button:
A pop-up box appears to test various protocols to see whether they will connect to the public Burp Collaborator server available ...
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