Are you getting following error while installing the Lets Encrypt SSL
Invalid response
Invalid response from https://acme-v02.api.letsencrypt.org/acme/authz-v3/12134772610.
Details:
Type: urn:ietf:params:acme:error:unauthorized
Status: 403
Detail: Invalid response from http://example.com/.well-known/acme-challenge/-isjdhfkjsdhf093TawbMWQ3Bw [IP]: "<HTML>\r\n<HEAD>\r\n<TITLE>500 Internal Server Error</TITLE>\r\n<BASE href=\"/error_docs/\"><!--[if lte IE 6]></BASE><![endif]-->\r\n</HEA"
Here is quick fix if you are installing it site hosted on WINDOW hosting. After taking backup of web.config rename it web.config TO –web.config
Try installing the Lets Encrypt again and most likely it should now work. We resolved our issue by doing this way.
Also check your file system if you have .well-known folder and related subfolder.
https://www.example.com/.well-known/acme-challenge/dVVjnDCzw44uB_j438739457sdfjh9gLWxtZds8N-Jy0Video Install Let’s Encrypt free SSL on Windows with Auto renewal using WACS ACME client
Video : How to Install let’s Encrypt with IIS on Window server 2022
