Same here. I'm stuck after 4 days searching articles on the internet... After entering my password during the pxe boot i got these errors ;
RequestMPKeyInformation: Send() failed. SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) Failed to get information for MP: http://MYSCCMSERVER.com 80004005. SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE::MP_InitializeTransport failed; 0x80004005 SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE::MP_LookupDevice failed; 0x80004005 SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE Provider failed to initialize MP connection. Unknown error (Error: 80004005; Source: Unknown) SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) RequestMPKeyInformation: Send() failed. SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) Failed to get information for MP: http://MYSCCMSERVER.com. 80004005. SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE::MP_InitializeTransport failed; 0x80004005 SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE::MP_ReportStatus failed; 0x80004005 SMSPXE 24/01/2013 20:43:23 1980 (0x07BC) PXE::CPolicyProvider::InitializeMPConnection failed; 0x80004005 SMSPXE 24/01/2013 20:43:23 1980 (0x07BC)
I did a cleane install with SP1 included. RTM version was working correctly before.
Then i rebooted my DNS/DHCP servers and it starting to working again....