I've added another certificate for all domains this time. It would seem the output gets more verbose each time I do this.
Connection: close
Content-type: text/html; charset="utf-8"
X-Error-Message: The cPanel Server operation timed out at cpsrvdpl line 531
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>500 Internal Server Error</title>
<style type="text/css">
.errortype {
font-family:verdana,arial,helvetica,clean,sans-serif;
font-size:x-large;
font-weight:bold;
}
.errormessage {
font-family:verdana,arial,helvetica,clean,sans-serif;
font-size:large;
whitespace:pre;
margin-left:20px;
}
p.errormessage { color:#ff0000; }
.serverinfo {
font-family:verdana,arial,helvetica,clean,sans-serif;
font-size:medium;
}
</style>
</head>
<body>
<h1 class="errortype">Internal Server Error</h1>
<p class="errormessage">500<pre>The cPanel Server operation timed out at cpsrvd.pl line 531.
</pre></p>
<hr>
<address class="serverinfo">cpsrvd/11.62.0.16 Server at johnny.heliohost.org</address>
</body>
</html>
But still the new certificate showed up when browsing current certificates. Could you check how serious this error is? (Whether all that remains is waiting 24h) Sorry for the hassle.