Symptoms
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When opening a website over HTTP in a web-browser, the following error is shown:
Forbidden
You do not have permission to access this document. -
When opening this website in a web-browser of Windows Server where the website is hosted, the error is:
403.4 Forbidden The page you are trying to access is secured with Secure Sockets Layer (SSL).
Module IIS Web Core
Notification BeginRequest
Handler ExtensionlessUrlHandler-Integrated-4.0
Error Code 0x80070005
Requested URL http://example.com:80/
Physical Path C:Inetpubvhostsexample.comhttpdocs
Logon Method Not yet determined
Logon User Not yet determinedMore Information:
This error means that the requested Web page requires SSL. Try to browse to the same URL, but use "https:" instead of "http:". -
When issuing a Let's Encrypt certificate for this domain, the operation fails with:
Could not issue an SSL/TLS certificate for example.com
...
The authorization token is not available at http://example.com/.well-known/acme-challenge/iF3RL6ACkbhfXrUW5I84u6hur7Qgfdslb8QNGlvMpzo.
...
Details:
Type: urn:ietf:params:acme:error:unauthorized
Status: 403
Detail: 203.0.113.2: Invalid response from http://example.com/.well-known/acme-challenge/iF3RL6ACkbhfXrUW5I84u6hur7Qgfdslb8QNGlvMpzo: 403
Cause
The Require SSL/TLS option is enabled for the domain in Plesk at Domains > example.com > Hosting & DNS > IIS Settings.
Because of the Require SSL/TLS option, a web-browser forces HTTPS secure connection, but the website is served over HTTP and the 403 forbidden error is returned.
Resolution
To make the website accessible over HTTP, disable the Require SSL/TLS IIS option:
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in Plesk
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Go to Domains > example.com > Hosting & DNS > IIS Settings.
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Disable Require SSL/TLS option under the section Directory Security Settings.
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Apply the changes.
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in IIS Manager
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Connect to the Plesk server via RDP.
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Disable Require SSL option in IIS Manager at Sites > example.com > SSL Settings and apply the changes.
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with