What if port 80 is blocked

How are you testing that 80 is blocked? A lot of ISP's block port 80 to stop people running webservers on consumer accounts. Have you installed any anti virus software recently?

That can cause problems with ports. And have you tried system restore? Where are these incoming connections coming from? Are you testing incoming connections from another machine on your local network, or from machines in the internet? At work, where you say things work, are you testing incoming connections from another machine on your local network, or from machines in the internet? If you are trying to test incoming connections to your laptop from the internet when you're at home, and you have a router, does your router port-forward port 80 from it to your laptop?

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? The configuration procedure is different for each operating system. See below for instructions. The following directions detail how to enable port 80 in addition to port Enabling an additional port is recommended over changing the existing port.

Port is also used for server-to-server and client-to-server communication so it's important that this port continue to be made available. Enable port 80 and by changing the appropriate settings from N to a Y. They should look like:.

Change the server port in all providers installed on your network. The server port is set in the print-provider. Change the server port in the User Client The User Client tool is an add-on that resides on a user's desktop. It will attempt to connect to your IP address, on the specific port, and let you know if it is open or closed to the outside world. Local issues too? Sounds like the Windows 7 firewall is cutting you off.

Add an exception with this tutorial Running netstat -a -n or ss -a -n from a command prompt will show all of the network connections open and the listening ports on your machine. You can add -b to the command and it will show which executable is using that port. You can get the same information using the Resource Monitor in Windows 7 under the Listening Ports section of the Network tab.

If you want to see if it is open from another server you can just telnet serverName 80 and see if the session opens. If it doesn't, than the either the server is not listening, or the port is blocked by a firewall. If it opens and then closes right away, at least windows , then the software such as Exchange might not be configured to listen on that particular interface or IP, but it is listening on other ports.

I have seen IIS behave this way because it is stupid, Apache might not. Although this may sound strange, you actually don't have a problem with open ports but with Apache config. That "Forbidden" message comes from your Apache server; it means that your webserver is accessible from the Internet. You need to configure Apache to allow serving to all hosts - otherwise they'll get the "Forbidden" page. IIRC, Apache is initially set up to only allow requests from the local computer.

Somewhere in your Apache config, there's probably a section like this the actual directory may be different :. If you want to allow any computer to see your pages, you need to change the Deny from all to Allow from all.

See the access module documentation for more info. It's not enough if you see your port 80 open from localhost - maybe something standing in the way if you try it from elsewhere, that's why I recommend nmap.

It can tell you which program is using what port. Server ports can either be bound to a single IP address or to every available IP address. It sounds like your Apache install is set up to bind only to In your httpd.

It has the virtue of being installed on pretty much every computer in the world. This will tell you if port 80 is open on your machine. Now if you want to check and see if you can access it from outside of your network will determine if you have sort of firewall in place.

If you do you will need to forward port 80 to your web server. It does not mean they can'tget internet access. Beside above, does port 80 need to be open? Note: TCP Port 80 is open for outgoingcommunications by default in most firewall software. So you shouldnot have to open any ports in the firewallsoftware running on Rhino workstations. Forwarding port 80 is no more insecurethan any other port. In fact, port forwarding itselfis not inherently insecure.

The security concern is that it allowsservices that are normally protected behind some kind of firewallto be accessible publicly. Asked by: Ferdaous Imaoz technology and computing email What happens if I block port 80? Last Updated: 3rd August, Your web browser uses port 80 outgoing to makeweb requests, so if you're blocking incoming port80 , all you're blocking is the attempts of others toconnect to the web server you're running on your computer whichyou probably aren't.

Block outgoing port 80 andyou'll block your web browser from surfing theinternet. Abigail Prestamo Professional. How can I tell if a port is blocked? Checking Windows Firewall for blocked ports.

Launch Command Prompt. Run netstat -a -n. Check to see if the specific port is listed.