Time machine server makes client freeze.

I got a macpro server with 10.8.3 and osx server running on the network as a time machine backup.
After the server is a few hours connected to the mac pro client with a gigabit network connection, the client feezes. Not responding to anything.
When I dissconect the network cable, all remains normal.
This happens everyday when I leave the system on overnight.
Does anyone know where to start looking?
Cheers,
Karel.

Thank you,
I turned off the server and disconnected before leaving last night and even then it crashed at 5.50 in the morning... This is what I got. As you can see it cycles trough the same things over and over.
Until it finally frose around 05:50:55,419.
I did a hard reset of the system on 09:43:38,000.
Thanks for any help!
13/06/13 03:50:55,167 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 04:05:55,197 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 04:19:06,000 kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=1275[GoogleSoftwareUp] clearing CS_VALID
13/06/13 04:20:55,226 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 04:35:55,278 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 04:35:56,864 AddressBookSourceSync[1284]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 04:35:57,039 AddressBookSourceSync[1284]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 04:35:57,283 AddressBookSourceSync[1284]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 04:35:57,474 AddressBookSourceSync[1284]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********/contacts///***********%[email protected]/***********/contacts/
13/06/13 04:35:57,718 AddressBookSourceSync[1284]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********/contacts/address book///***********%[email protected]/***********/contacts/addressbook/
13/06/13 04:42:00,224 com.apple.backupd[1290]: Starting automatic backup
13/06/13 04:42:00,230 com.apple.backupd[1290]: Backup failed with error: 19
13/06/13 04:50:55,305 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 05:05:55,333 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 05:17:49,000 kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=1297[GoogleSoftwareUp] clearing CS_VALID
13/06/13 05:20:55,361 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 05:35:55,393 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 05:35:56,897 AddressBookSourceSync[1312]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 05:35:57,078 AddressBookSourceSync[1312]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 05:35:57,322 AddressBookSourceSync[1312]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********///***********%[email protected]/***********/
13/06/13 05:35:57,517 AddressBookSourceSync[1312]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********/contacts///***********%[email protected]/***********/contacts/
13/06/13 05:35:57,763 AddressBookSourceSync[1312]: AOSKit ERROR: RAF: Invalid url -- https://***********%[email protected]/***********/contacts/address book///***********%[email protected]/***********/contacts/addressbook/
13/06/13 05:42:30,514 com.apple.backupd[1318]: Starting automatic backup
13/06/13 05:42:30,519 com.apple.backupd[1318]: Backup failed with error: 19
13/06/13 05:50:55,419 mDNSResponder[59]: Double NAT (external NAT gateway address 10.205.128.29 is also a private RFC 1918 address)
13/06/13 09:43:38,000 bootlog[0]: BOOT_TIME 1371109418 0

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Message was edited by: cmburkhalter
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Well SAM
It actually worked. THANKS A BUNCH! I trying again as root, allthough I thought sudo did it.
I needed to first do some repairing (permissions and so on), change the host name and bind all the machines anew to server.
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So aganin: thank you. I am sorry I can't find how to change the appraisal of your answer from 'helped' to 'solved' to give you more credit(s).
Francesco

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