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Running Open & Click tracking and IIS on the same machine

It is important for deliverability reasons to use HTTP port 80 for open and click tracking.  If you have IIS installed, by default it will take ownership of port 80 on all IP Addresses. When this happens, setting the MTA to use port 80 will result in the error below when starting the server.

System.Net.Sockets.SocketException (0x80004005): Only one usage of each socket address (protocol/network address/port) is normally permitted at System.Net.Sockets.Socket.DoBind

To fix this on Windows Server 2008 and later you can use the netsh command line tool to release port 80 for IP's not being used by an IIS web site.

To display all IP addresses in the IIS IP listen list
netsh http show iplisten

To add an ip to IIS
netsh http add iplisten ipaddress=

To remove an IP from IIS
netsh http delete iplisten ipaddress=

Be sure to test your IIS websites after using these commands to ensure that there were no unintended consequences.

You can find more information at

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