Hi, I have set up calendarserver on my Raspberry Pi (Raspbian~Debian) for personal usage. I wanted to handle all communications on a secure connection therefore, I do want to use SSL/TLS only. After I set up everything, I could browse the root directory on non-tls channel. Then I wanted to create a self-signed certificate to secure the connection. I had a pair of .pem and .key files, which I referenced in the configuration. I made sure, they are accessible. Then, I tried to "browse" the root directory again, but webpage never loaded (it was is being loaded for a very long time). Then I checked the error.log file and here what I have found: 2016-01-24 23:01:50+0100 [-] [caldav-1] [-] Unhandled Error 2016-01-24 23:01:50+0100 [-] [caldav-1] Traceback (most recent call last): 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 73, in callWithContext 2016-01-24 23:01:50+0100 [-] [caldav-1] return context.call({ILogContext: newCtx}, func, *args, **kw) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118, in callWithContext 2016-01-24 23:01:50+0100 [-] [caldav-1] return self.currentContext().callWithContext(ctx, func, *args, **kw) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81, in callWithContext 2016-01-24 23:01:50+0100 [-] [caldav-1] return func(*args,**kw) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/internet/selectreactor.py", line 149, in _doReadOrWrite 2016-01-24 23:01:50+0100 [-] [caldav-1] why = getattr(selectable, method)() 2016-01-24 23:01:50+0100 [-] [caldav-1] --- <exception caught here> --- 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twext/internet/sendfdport.py", line 286, in doRead 2016-01-24 23:01:50+0100 [-] [caldav-1] transport = self.transportFactory(skt, description, protocol) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twext/web2/metafd.py", line 104, in createTransport *2016-01-24 23:01:50+0100 [-] [caldav-1] transport.startTLS(self.contextFactory)2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/internet/_newtls.py", line 179, in startTLS2016-01-24 23:01:50+0100 [-] [caldav-1] startTLS(self, ctx, normal, FileDescriptor)2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/internet/_newtls.py", line 139, in startTLS* 2016-01-24 23:01:50+0100 [-] [caldav-1] tlsFactory = TLSMemoryBIOFactory(contextFactory, client, None) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/protocols/tls.py", line 769, in __init__ 2016-01-24 23:01:50+0100 [-] [caldav-1] contextFactory = _ContextFactoryToConnectionFactory(contextFactory) 2016-01-24 23:01:50+0100 [-] [caldav-1] File "/usr/lib/python2.7/dist-packages/twisted/protocols/tls.py", line 648, in __init__ 2016-01-24 23:01:50+0100 [-] [caldav-1] oldStyleContextFactory.getContext() 2016-01-24 23:01:50+0100 [-] [caldav-1] *exceptions.AttributeError: 'NoneType' object has no attribute 'getContext'* 2016-01-24 23:01:50+0100 [-] [caldav-1] I also tried letsencrypt's CA certificate, I had the same problem. What might be the problem? Is it a bug or the server doesn't like the certificate for some reason? Thanks a lot!