I'm running Windows 7 x86 with only Windows Firewall and I'm getting truncated downloads too, Firefox just gives up and calls them "completed" while Free Download Manager says "Connection Lost" and gets 0b/s after that.

 

Occasionally I get a full download, it seems more likely to fail with more concurrent downloads but it could be a coicidence. I've got a Optus Internet retail cable broadband connection in Melbourne, Australia.

 

Tracing route to mschannel9.vo.msecnd.net [70.37.159.194]
over a maximum of 30 hops:

  1     1 ms     1 ms     1 ms  192.168.1.1
  2    16 ms    10 ms    45 ms  10.40.64.1
  3    10 ms    16 ms     9 ms  meb4-pos4-2-2.gw.optusnet.com.au [198.142.144.14
5]
  4    27 ms     9 ms    14 ms  xe-3-1-0.md11.optus.net.au [119.225.14.253]
  5     *        *        *     Request timed out.
  6    25 ms    11 ms    29 ms  GigabitEthernet4-5.lon42.Melbourne.telstra.net [
139.130.96.89]
  7    11 ms    10 ms    10 ms  TenGigabitEthernet0-12-0-2.exi-core1.Melbourne.t
elstra.net [203.50.80.1]
  8    27 ms    33 ms    26 ms  Bundle-POS1.chw-core2.Sydney.telstra.net [203.50
.6.13]
  9    34 ms    24 ms    26 ms  TenGigabitEthernet7-1.chw51.Sydney.telstra.net [
203.50.20.194]
 10    25 ms    55 ms    62 ms  micros20.lnk.telstra.net [139.130.254.78]
 11     *        *        *     Request timed out.
 12    25 ms    33 ms    26 ms  cds13.syd9.msecn.net [70.37.159.194]

 

It seems that the server refuses to return data to Range requests.

 

Sample log:

12:02:37 AM 2/Dec/2009 Request...
12:02:37 AM 2/Dec/2009 GET /o9/ch9/2/7/8/5/0/5/IE9JSEngineEarlyLook_Zune_ch9.wmv HTTP/1.1
Referer: http://ecn.channel9.msdn.com/o9/ch9/2/7/8/5/0/5/
Cookie: omniID=1252076663327_c9b3_07af_3aae_ee9bb3bfa6a4
Host: ecn.channel9.msdn.com
12:02:38 AM 2/Dec/2009 HTTP/1.1 200 OK
Date: Tue, 01 Dec 2009 13:02:38 GMT
Server: Apache
Last-Modified: Sat, 14 Nov 2009 04:11:20 GMT
Accept-Ranges: bytes
Content-Length: 175463331
Content-Type: video/x-ms-wmv
Connection: keep-alive


12:02:39 AM 2/Dec/2009 Done
12:27:53 AM 2/Dec/2009 Starting download...
12:27:53 AM 2/Dec/2009 GET /o9/ch9/2/7/8/5/0/5/IE9JSEngineEarlyLook_Zune_ch9.wmv HTTP/1.1
Referer: http://ecn.channel9.msdn.com/o9/ch9/2/7/8/5/0/5/
Cookie: omniID=1252076663327_c9b3_07af_3aae_ee9bb3bfa6a4
Host: ecn.channel9.msdn.com
12:27:54 AM 2/Dec/2009 HTTP/1.1 200 OK
Date: Tue, 01 Dec 2009 13:27:53 GMT
Server: Apache
Last-Modified: Sat, 14 Nov 2009 04:11:20 GMT
Accept-Ranges: bytes
Content-Length: 175463331
Content-Type: video/x-ms-wmv
Connection: keep-alive


12:27:54 AM 2/Dec/2009 Opening file on the disk...
12:27:54 AM 2/Dec/2009 Succeeded
12:27:54 AM 2/Dec/2009 [Section 1] - Started
12:27:54 AM 2/Dec/2009 [Section 1] - Downloading
12:27:57 AM 2/Dec/2009 Preparing files on the disk... This may take several minutes
12:28:15 AM 2/Dec/2009 [Section 1] - Connection with the server was lost
12:28:15 AM 2/Dec/2009 [Section 1] - Connecting...
12:28:15 AM 2/Dec/2009 GET /o9/ch9/2/7/8/5/0/5/IE9JSEngineEarlyLook_Zune_ch9.wmv HTTP/1.1
Referer: http://ecn.channel9.msdn.com/o9/ch9/2/7/8/5/0/5/
Range: bytes=1328907-
Cookie: omniID=1252076663327_c9b3_07af_3aae_ee9bb3bfa6a4
Host: ecn.channel9.msdn.com
12:28:16 AM 2/Dec/2009 HTTP/1.1 206 Partial Content
Date: Tue, 01 Dec 2009 13:28:15 GMT
Server: Apache
Last-Modified: Sat, 14 Nov 2009 04:11:20 GMT
Accept-Ranges: bytes
Content-Type: video/x-ms-wmv
Content-Range: bytes 1328907-175463330/175463331
Content-Length: 174134424
Connection: keep-alive


12:28:16 AM 2/Dec/2009 [Section 1] - Connection succeeded
12:28:16 AM 2/Dec/2009 [Section 1] - Downloading
12:28:45 AM 2/Dec/2009 [Section 1] - Connection with the server was lost
12:28:45 AM 2/Dec/2009 [Section 1] - Connecting...
12:28:45 AM 2/Dec/2009 GET /o9/ch9/2/7/8/5/0/5/IE9JSEngineEarlyLook_Zune_ch9.wmv HTTP/1.1
Referer: http://ecn.channel9.msdn.com/o9/ch9/2/7/8/5/0/5/
Range: bytes=2412011-
Cookie: omniID=1252076663327_c9b3_07af_3aae_ee9bb3bfa6a4
Host: ecn.channel9.msdn.com
12:28:45 AM 2/Dec/2009 HTTP/1.1 206 Partial Content
Date: Tue, 01 Dec 2009 13:28:45 GMT
Server: Apache
Last-Modified: Sat, 14 Nov 2009 04:11:20 GMT
Accept-Ranges: bytes
Content-Type: video/x-ms-wmv
Content-Range: bytes 2412011-175463330/175463331
Content-Length: 173051320
Connection: keep-alive


12:28:46 AM 2/Dec/2009 [Section 1] - Connection succeeded
12:28:46 AM 2/Dec/2009 [Section 1] - Downloading
12:31:42 AM 2/Dec/2009 [Section 1] - Connection with the server was lost
12:31:42 AM 2/Dec/2009 [Section 1] - Connecting...
12:31:42 AM 2/Dec/2009 GET /o9/ch9/2/7/8/5/0/5/IE9JSEngineEarlyLook_Zune_ch9.wmv HTTP/1.1
Referer: http://ecn.channel9.msdn.com/o9/ch9/2/7/8/5/0/5/
Range: bytes=23709195-
Cookie: omniID=1252076663327_c9b3_07af_3aae_ee9bb3bfa6a4
Host: ecn.channel9.msdn.com
12:31:43 AM 2/Dec/2009 HTTP/1.1 206 Partial Content
Date: Tue, 01 Dec 2009 13:31:42 GMT
Server: Apache
Last-Modified: Sat, 14 Nov 2009 04:11:20 GMT
Accept-Ranges: bytes
Content-Type: video/x-ms-wmv
Content-Range: bytes 23709195-175463330/175463331
Content-Length: 151754136
Connection: keep-alive


12:31:43 AM 2/Dec/2009 [Section 1] - Connection succeeded
12:31:43 AM 2/Dec/2009 [Section 1] - Downloading