PENDING Computers will not PXE boot after OS upgrade to Server 2019

[muels7]

I followed Microsoft's documentation on how to complete an in-place upgrade on a SCCM server. I it was running 2012 R2 and I upgraded it to 2019. Ever since we have not been able to PXE boot any machines for OSD. In my SMSPXE log, I keep seeing the the following errors, but I have not been able to find a definitive answer on what it means. If someone could point me in the right direction, that would be a big help.

SSL, using authenticator in request. SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

In SSL, but with no client cert. SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

SSL, using authenticator in request. SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

In SSL, but with no client cert. SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

RequestMPKeyInformation: Send() failed. SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

PXE: B0:4F:13:CA:06:CA: Unsuccessful in getting MP key information. 0x80004005. SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

PXE::MP::InitializeTransport failed; 0x80004005 SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

PXE::MP::IsKnownMachine failed; 0x80070490 SCCMPXE 8/30/2022 3:12:02 PM 12840 (0x3228)

RequestMPKeyInformation: Send() failed. SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

PXE: B0:4F:13:CA:06:CA: Unsuccessful in getting MP key information. 0x80004005. SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

PXE::MP::InitializeTransport failed; 0x80004005 SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

PXE::MP::IsKnownMachine failed; 0x80070490 SCCMPXE 8/30/2022 3:12:02 PM 9356 (0x248C)

 

[Prajwal Desai]

Is your Management Point healthy?. Verify that in the monitoring workspace.

 

[muels7]

I ended up restoring the whole server from a backup. That resolved the issue.