SCCM 2012 - Error sending DAV request. HTTP code 401, status 'Unauthorized'

Hi everyone!

I have a SCCM 2012 install with SQL 2008 R2 RU6 on it. All roles on the same server.

Application deployment was working last week and suddently, today, it's not working anymore.

Client fail to download applications. When I see the log "dataTransfertService.log" I got:

<![LOG[Enumerating DTS jobs for logged on user 'S-1-5-21-3498061407-3801314532-3722532443-1799'.]LOG]!><time="16:45:51.388-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="3536" file="dtslogon.cpp:135"><![LOG[Enumeration of DTS jobs for logged on user 'S-1-5-21-3498061407-3801314532-3722532443-1799' is complete.]LOG]!><time="16:45:51.878-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="3536" file="dtslogon.cpp:151"><![LOG[Enumerating DTS jobs for helper user 'S-1-5-21-3498061407-3801314532-3722532443-1799'.]LOG]!><time="16:45:51.878-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="3536" file="dtslogon.cpp:154"><![LOG[Enumeration of DTS jobs for helper user 'S-1-5-21-3498061407-3801314532-3722532443-1799' is complete.]LOG]!><time="16:45:51.939-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="3536" file="dtslogon.cpp:170"><![LOG[UpdateURLWithTransportSettings(): OLD URL - http://xxx.com/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1]LOG]!><time="16:48:31.738-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="5616" file="ccmutillib.cpp:3083"><![LOG[UpdateURLWithTransportSettings(): NEW URL - http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1]LOG]!><time="16:48:31.738-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="5616" file="ccmutillib.cpp:3095"><![LOG[DTSJob {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} created to download from 'http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1' to 'C:\WINDOWS\ccmcache\3f'.]LOG]!><time="16:48:31.816-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="5616" file="datatransferservice.cpp:186"><![LOG[DTSJob {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} in state 'DownloadingManifest'.]LOG]!><time="16:48:31.816-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="2432" file="dtsjob.h:157"><![LOG[[CCMHTTP] ERROR: URL=http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1, Port=80, Options=224, Code=0, Text=CCM_E_BAD_HTTP_STATUS_CODE]LOG]!><time="16:48:32.281-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="ccmhttperror.cpp:291"><![LOG[Raising event:
instance of CCM_CcmHttp_Status
{
	ClientID = "GUID:4D48BE30-A5BE-40C1-A946-B0773DE7C060";
	DateTime = "20120723144832.297000+000";
	HostName = "xxx.com";
	HRESULT = "0x87d0027e";
	ProcessID = 2236;
	StatusCode = 401;
	ThreadID = 4204;
};
]LOG]!><time="16:48:32.297-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="event.cpp:729"><![LOG[Successfully sent location services HTTP failure message.]LOG]!><time="16:48:32.312-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="ccmhttperror.cpp:395"><![LOG[Error sending DAV request. HTTP code 401, status 'Unauthorized']LOG]!><time="16:48:32.312-120" date="07-23-2012" component="DataTransferService" context="" type="3" thread="4204" file="util.cpp:629"><![LOG[GetDirectoryList_HTTP('http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1') failed with code 0x80070005.]LOG]!><time="16:48:32.312-120" date="07-23-2012" component="DataTransferService" context="" type="3" thread="4204" file="util.cpp:688"><![LOG[Job {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} impersonating Network Access Account.]LOG]!><time="16:48:32.825-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="netaccessaccount.cpp:429"><![LOG[[CCMHTTP] ERROR: URL=http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1, Port=80, Options=224, Code=0, Text=CCM_E_BAD_HTTP_STATUS_CODE]LOG]!><time="16:48:32.887-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="ccmhttperror.cpp:291"><![LOG[Raising event:
instance of CCM_CcmHttp_Status
{
	ClientID = "GUID:4D48BE30-A5BE-40C1-A946-B0773DE7C060";
	DateTime = "20120723144832.887000+000";
	HostName = "xxx.com";
	HRESULT = "0x87d0027e";
	ProcessID = 2236;
	StatusCode = 401;
	ThreadID = 4204;
};
]LOG]!><time="16:48:32.887-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="event.cpp:729"><![LOG[Successfully sent location services HTTP failure message.]LOG]!><time="16:48:32.902-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="ccmhttperror.cpp:395"><![LOG[Error sending DAV request. HTTP code 401, status 'Unauthorized']LOG]!><time="16:48:32.902-120" date="07-23-2012" component="DataTransferService" context="" type="3" thread="4204" file="util.cpp:629"><![LOG[GetDirectoryList_HTTP('http://xxx.com:80/SMS_DP_SMSPKG$/Content_1173b7a8-9bbf-42cc-8b0f-abd1c3f3065c.1') failed with code 0x80070005.]LOG]!><time="16:48:32.902-120" date="07-23-2012" component="DataTransferService" context="" type="3" thread="4204" file="util.cpp:688"><![LOG[Job {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} reverted impersonation.]LOG]!><time="16:48:32.902-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="4204" file="netaccessaccount.h:93"><![LOG[DTSJob {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} in state 'Cancelled'.]LOG]!><time="16:48:33.011-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="5616" file="dtsjob.h:157"><![LOG[DTSJob {451ACA72-8FCC-4083-B7B5-C4C68D5E5786} cancelled by client.]LOG]!><time="16:48:33.011-120" date="07-23-2012" component="DataTransferService" context="" type="1" thread="5616" file="dtsjob.cpp:2771">

I already verified every single permissions, NAA is configured and has correct rights. I really don't understand what has changed...

any suggestion???

Thank you very much!