Create Certificate Failed

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. |, so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command: wacs

It produced this output: Unable to activate listener, this may be because of insufficient rights or a non-Microsoft webserver using port 80
An error occured while commiting validation configuration: Failed to listen on prefix 'http://+:80/.well-known/acme-challenge/' because it conflicts with an existing registration on the machine.

My web server is (include version): IIS

The operating system my web server runs on is (include version): WS2016

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know): yes yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Please note that the existing server also hosts other small websites which I have control to the domains whereas this particular domain is subscribed by other person who simply wants me to host his website.


Got it fixed but upgrading win-acme to 2.1.15.


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