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CROSSPOST multiple firewalls and anti-virus programs

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CG IT

as well as your firewalls. you said to block port 80 and it is.

computers, networking devices, applications and browsers know that http://www.<domainname.com equates to looking for a web address by an IP address and port #. HTTP is a protocol and that protocol uses port 80. HTTPS is a different protocol and doesn't use port 80 rather uses port 443. That's why it works.

What you haven't provided is what firewalls your using? If might be a simple configuration change on the firewall that will again allow outbound and inbound traffic on port 80.