Monthly Archives: January 2021

ASP.NET Error message Unable to connect to web server ‘IIS Express’

When you get the error “Unable to connect to web server ‘IIS Express’ you probably try to start the website with a port that is in an excluded port range

Unable to connect to web server ‘IIS Express’

List the excluded port ranges with the command below:

netsh interface ipv4 show excludedportrange protocol=tcp

Sample output may look something like this:

Now to change the port for your web site right select the dropdown right to the IIS Express label

Then select [YOUR PROJECT] debug properties and change the port on the properties page (highlighted below)

Change debug settings for project
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