Calendar Server does not start since today morning

(please sorry for my cruel English [you can answer in German])

In the Error-Logfile of the CAL and CARD Server is the following Text:

Can someone tell me, what the Problem is?

2015-08-13 11:28:30+0200 [-] [caldav-4] ]

2015-08-13 14:43:19+0200 [-] [caldav-4] [-] [txweb2.channel.http#error] Connection aborted - took too long to close: IPv4Address(TCP, '95.90.243.31', 56540)

2015-08-14 06:13:56+0200 [-] [caldav-0] [-] [calendarserver.push.applepush.APNFeedbackFactory#error] Unable to connect to APN feedback server: [Failure instance: Traceback: <class 'socket.gaierror'>: [Errno 8] nodename nor servname provided, or not known

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:783:__bootstrap

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:810:__bootstrap_inner

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:763:run

2015-08-14 06:13:56+0200 [-] [caldav-0] --- <exception caught here> ---

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/threadpool.py:191:_worker

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/context.py:118:callWithContext

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/context.py:81:callWithContext

2015-08-14 06:13:56+0200 [-] [caldav-0] ]

2015-08-14 06:13:56+0200 [-] [caldav-0] [-] [calendarserver.push.applepush.APNFeedbackFactory#error] Unable to connect to APN feedback server: [Failure instance: Traceback: <class 'socket.gaierror'>: [Errno 8] nodename nor servname provided, or not known

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:783:__bootstrap

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:810:__bootstrap_inner

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threadin g.py:763:run

2015-08-14 06:13:56+0200 [-] [caldav-0] --- <exception caught here> ---

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/threadpool.py:191:_worker

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/context.py:118:callWithContext

2015-08-14 06:13:56+0200 [-] [caldav-0] /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twis ted/python/context.py:81:callWithContext

2015-08-14 06:13:56+0200 [-] [caldav-0] ]

2015-08-14 08:39:58+0200 [-] (UNIX Port '/var/run/caldavd/caldavd.sock' Closed)

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [-] Received SIGTERM, shutting down.

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,1,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,4,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,5,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,6,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,2,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,3,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,7,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [-] (UNIX Port '/var/run/caldavd/directory-proxy.sock' Closed)

2015-08-14 08:39:58+0200 [-] [directoryproxy] 2015-08-14 08:39:58+0200 [DirectoryProxyAMPProtocol,0,] DirectoryProxyAMPProtocol connection lost (HOST:UNIXAddress('/var/run/caldavd/directory-proxy.sock') PEER:UNIXAddress(None))

2015-08-14 08:40:03+0200 [-] [txdav.base.datastore.subpostgres#warn] postgres process ended with status 0