Is port 6667 being blocked when using HTML?

We have setup a new project using a HTML page to load some XML contents, it works perfectly, but then by chance we changed the URL to a new one using port 6667 and the XML section stopped responding, checking on the internet i found that port 6667 is blocked by default on many browsers because is a very popular port for virus transmission

Internet Browsers Blocking Some Ports Due To Security Vulnerabilities | blueSPARK Data, LLC

Is the port 6667 (and others) also blocked by default on the birghtsign players?

Thanks for your help!!


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