Sorry for my very late reply, and thanks for the advice. There was very little logging I could use, but I found out that the HTTP server was crashing because of some characters in a URL request. These characters were not properly escaped. When the HTTP server exits, Suneido also exits. Proper escaping of characters in the URL request solved the problem. Probably I should find out how to make HTTPServer prevent from crashing, but I guess the HTTPServer in Suneido was never meant to be used as a production machine anyway.