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Issue Let's Encrypt: Internal error ;-P

cat24max

New Pleskian
Hey guys,

since this morning I am unable to issue any new LE certificates. It always loads for about 30-40 seconds, then end with: Internal error ;-P

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>500 Internal Server Error</title>
<link rel="stylesheet" href="/error_docs/styles.css">
</head>
<body>
<div class="page">
<div class="main">
<div class="error-description">
<h1>Server Error</h1>
<div class="error-code">500</div>
<h2>Internal Server Error</h2>
<p class="lead">
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
</p>
<hr/>
<p>If you think this is an error, please <a href="Contact Support - Plesk" target="_blank">let us know</a> so we can fix it!</p>
<p>That's what you can do</p>
<div class="help-actions">
<a href="javascript:location.reload();">Reload Page</a>
<a href="javascript:history.back();">Back to Previous Page</a>
<a href="/">Home Page</a>
</div>
</div>
<div class="help-links">
<a href="Contact Support - Plesk" class="help-link" title="Report a problem" target="_blank">
<div class="icon report"><svg><use xlink:href="/error_docs/symbols.svg#report"></use></svg></div>
</a>
<a href="Documentation and Help Portal for Plesk" class="help-link" title="Documentation" target="_blank">
<div class="icon documentation"><svg><use xlink:href="/error_docs/symbols.svg#documentation"></use></svg></div>
</a>
<a href="Help Center" class="help-link" title="Knowledge base" target="_blank">
<div class="icon knowledge-base"><svg><use xlink:href="/error_docs/symbols.svg#knowledge-base"></use></svg></div>
</a>
<a href="Plesk Forum" class="help-link" title="Forum" target="_blank">
<div class="icon forum"><svg><use xlink:href="/error_docs/symbols.svg#forum"></use></svg></div>
</a>
<a href="Plesk" class="help-link" title="YouTube" target="_blank">
<div class="icon youtube"><svg><use xlink:href="/error_docs/symbols.svg#youtube"></use></svg></div>
</a>
<a href="Plesk" class="help-link" title="Facebook" target="_blank">
<div class="icon facebook"><svg><use xlink:href="/error_docs/symbols.svg#facebook"></use></svg></div>
</a>
</div>
</div>
</div>
<script defer src="/error_docs/svgxuse.min.js"></script>
</body>
</html>


This happens to multiple subdomains for multiple domains. I have no idea what is happening. The web page opens up without any issue, even SSL (with certificate warning, though).
There is no PHP error in any of the log files...

How can I fix this?

(Using Win 2012, Plesk 17.5.3, IIS 8)
 
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