Error Code 64: Host not available

TMG 2010 SP2 RU2 as an edge firewall running on Hyper-V.

The following URL Works fine:

http://update.contoso.com/Packages/f5092a1d-2344-408a-a03a-f032d63dcdc2/PackageManifest.xml

The following similar URL to the same external host throws an error code 64,

http://update.contoso.com/Packages/6114f1cc-ab5e-4196-841f-d8aa8d42e994/PackageManifest.xml

Here is a snip from the diagnostic log:

114353

16.10.2012 14:04:04

0d722b7a
0d722bff

Web Proxy

Forefront TMG will connect to the Web server update.contoso.com on the IP
address x.x.x.x and port 80.

114354

16.10.2012 14:04:04

0d722b7a
0d722bff

Web Proxy

Forefront TMG is forwarding the request to the target host server for the
path
/Packages/6114f1cc-ab5e-4196-841f-d8aa8d42e994/PackageManifest.xml.

114355

16.10.2012 14:04:05

0d722b7a
0d722bff

Web Proxy

Forefront TMG rejected the request with the HTTP status code 0 and will
return the following error message to the Web client. "The specified network
name is no longer available. (64)"

Any ideas ?

Regards

Henning

Record	Time	Context	Log Source	Message

Error Code 64: Host not available

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