Question Details:

I AM USING FIREFOX. I AM TRYING TO RUN A PROGRAM CALLED USENEXT. IT IS A PAID DOWNLOAD SITE. IT WAS WORKING FINE UNTIL A COUPLE OF DAYS AGO. NOW IT WILL NOT RUN ON FIREFOX. IT TELLS ME I NEED TO OPEN PORT 443. I DO NOT HAVE WINDOWS FIRWALL OPEN AND. AS WELL THERE IS A WEBSITE I CANT CONNECT TO THAT I WAS HAVING NO PROBLEM WITH UNTIL THE SAME TIME MY USENEXT STARTED MESSING UP. WHAT CAN I DO PLEASE HELP ME?

Answer

Port 443 is for https (both tcp and udp protocols) and should be enabled by default. You might have disabled it via another firewall program.
Or you could access the internet via a firewalled router. In this case you should contact your network administrator to open port 443.

This problem can be caused by viruses too. Scan your computer with a good antivirus and remove all the malware.

This information can be useful too.