Hi, sorry for not getting back earlier. Apparently the forum notification wasn't working properly for me.
Here's as detailed as I can get.
Without Vista SP1 everything works beautifully.
Once I install SP1 the connection process will always stop at "Connecting to extender" in the MCE interface on my computer (The last step that is).
On my computer it will just stay at the last step indefinately until I cancel it but on my 360 I will see the "connecting" screen first for a few seconds and then I get a blue screen telling me:
"The Xbox 360 was unable to prepare a connection to the Windows Vista Media Center-based PC. Restart your Xbox 360 and try again."
Of course I've tried to restart both the computer and the 360 to no avail.
I've also tried the following: clearing out the MCE certificate as per instructions in the MS Knowledgebase. Repairing my internet connection. Connecting the 360 to the PC directly (without the router, both with a straight and a crossed network cable). Deleting all presence of the MCE accounts from both the PC and 360. Uninstalling/re-installing the extender driver etc.
Along with various other tips from people around the web (some pretty crazy ones as well ;) )
My computer is a Fujitsu Siemens Amilo PA 1538. It has a nVidia integrated ethernet controller. I connect through a D-Link DIR-100. (Note that the computer and router are European versions, if I'm not mistaken they go under different names in the US.)
The computer does not have any tuner whatsoever (nor video in capabilities)
Here are some of the error codes I have recieved through the process:
0x800704d4. (Couldn't send Media Center software to the extender.)
-209. (The installation failed with error code 209)
0x800403cb.(Could not exchange certificates with the device)
109 (GUI process was not terminated properly)
ERROR: SqmApiWrapper.TimerRecord failed; Win32 GetLastError returned 10000105
DefaultDomain
Media Center Guide
I don't think any of these errors have much to do with it though since the one below is the only one that is persistant: (Ie happens every time I try to create the connection, the ones above have happened once or twice only when I check through the error logs)
here's the one that I think is the issue though:
ERROR: SqmApiWrapper.TimerAccumulate failed; Win32 GetLastError returned 10000105
DefaultDomain
Media Center Guide
I googled the error above and found some hints about deleting recording schedueles and the content of some folder on the computer and I did so but the problem persists.
If I uninstall SP1 everything starts working just fine again. Re-install SP1 (doesn't matter if it's beta RC or the latest refresh) and it stops working again.
I'm not running any security/firewall/antivirus/adware software (though I've checked for viruses and adware and then uninstalled such apps) whatsoever and I've disabled UAC for what it's worth. I've also tried re-installing windows.
I'm starting to worry about this problem persisting in the final version of SP1. :(
About other people reporting the problem I was mainly referring to a blog entry with a discussion thread about the same issue but right now I can't seem to find it again. :/
PS. personally I wouldn't really care about the issue as the extender functionality is so outdated by now without support for MPEG4 etc but since I can't play MPEG2 files in the dashboard I really "need" extender functionality.
UPDATE: I also have a problem with the "WPD FileSystem Volume Driver". It stops working (cannot initialize driver) when SP1 is installed.
Same problem as decribed here:
http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=2746837&SiteID=17
I assume it has nothing to do with the media center extender but I thought I'd bring it up anyways.
pretty annoying bug since I cannot use my built in cardreader when SP1 is installed. Luckily for me though, unlike the guy in that thread, uninstalling SP1 makes it work just fine again for me.