When attempting to publish a package the following is reported:
HTTP/1.1 500 Internal Server Error
Connection: keep-alive
Content-Length: 141
Content-Type: text/html
Date: Sun, 23 Apr 2023 12:02:35 GMT
Server: nginx/1.23.2
<html>
<head>
<title>Internal Server Error</title>
</head>
<body>
<h1><p>Internal Server Error</p></h1>
</body>
</html>
This appears to be happening consistently for moderately sized SPK files (50-75 MB) and does not appear to be based on time of day (server load).