CALDAV server writes constantly too much into error log

Hi,
i managed to set up the OS X Server and CALDAV server, everything works fine, events can be synced to devices, macs, etc.
The firewall (Cisco RV042G) allows only SSL traffic and everythings works fine.
... but then I checked the error log:
2 strange entries are written several times in a minute:
1. APNProviderFactory#error
2013-04-25 11:20:47+0200 [-] [notifications] 2013-04-25 11:20:47+0200 [-] [calendarserver.push.applepush.APNProviderFactory#error] Unable to connect to APN server: [Failure instance: Traceback: <class 'socket.gaierror'>: [Errno 8] nodename nor servname provided, or not known
I can remove this entry if I open the firewall to allow all traffic from my OS X Server machine to ANY
But I don't like to do so, only open the ports I need.
Does anybody know, what else needs to be opened from OS X Server to stop this error entry?
Currently I allow the following outgoing traffic:
Service
Port
Source
Destination
SMTP
25 TCP
OS X Server
Any
IMAP
143 TCP
OS X Server
Any
Device Enrollment
1640 TCP
OS X Server
Any
Device Management
2195 TCP
OS X Server
Any
Push Feedback Service
2196 TCP
OS X Server
Any
CALDAV SSL
8443 TCP
OS X Server
Any
CARDDAV SSL
8843 TCP
OS X Server
Any
2. every 5 seconds I see the following added to the error log:
2013-04-25 12:16:24+0200 [-] [notifications] 2013-04-25 12:16:24+0200 [-] Starting factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3cc128>
2013-04-25 12:16:24+0200 [-] [notifications] 2013-04-25 12:16:24+0200 [APNProviderProtocol (TLSMemoryBIOProtocol),client] <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3cc128> will retry in 2 seconds
2013-04-25 12:16:24+0200 [-] [notifications] 2013-04-25 12:16:24+0200 [APNProviderProtocol (TLSMemoryBIOProtocol),client] Stopping factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3cc128>
any idea what needs to be done?
Thanks a lot for any idea to get the log quiet.
~ Markus

Hi,
i checked again and found, that TCP 5223 is no longer only associated to iCHAT SSL, it is now associated to Push-Notification.
I added IN - OUT for TCP 5223 and this seems to help a lot.
I updated the ports list I'm using - added that traffic is allowed incoming and outgoing to each of the ports (only DNS is outgoing)
Service
Port
In/Out
In/Out
SMTP
25 TCP
OS X Server
Any
IMAP
143 TCP
OS X Server
Any
Device Enrollment
1640 TCP
OS X Server
Any
Device Management
2195 TCP
OS X Server
Any
Push Feedback Service
2196 TCP
OS X Server
Any
CALDAV SSL
8443 TCP
OS X Server
Any
CARDDAV SSL
8843 TCP
OS X Server
Any
Push Notification
5223 TCP
OS X Server
Any
DNS
53 UDP
OS X Server [out only]
Any
The messages are no longer written constantly, they are now happing rarely.
At: 10:46 I got one new entry and the last at:
2013-04-26 12:13:30+0200 [-] [notifications] 2013-04-26 12:13:30+0200 [APNProviderProtocol (TLSMemoryBIOProtocol),client] <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3c6ea8> will retry in 2 seconds
2013-04-26 12:13:30+0200 [-] [notifications] 2013-04-26 12:13:30+0200 [APNProviderProtocol (TLSMemoryBIOProtocol),client] Stopping factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3c6ea8>
2013-04-26 12:13:33+0200 [-] [notifications] 2013-04-26 12:13:33+0200 [-] Starting factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10b3c6ea8>
I'm not sure under which circumstances this happens.
First guess was adding an event or a reminder on an iPhone, but this cannot be verified.
Maybe this is because I allow only SSL in/out for CARD/CALDAV. I don't know.
But the log is more or less growing is an expected way.
So I can check other logs... I think there are some more suspicious growings out there ;-)
~ Markus

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