Running SCCM 1910, we have successfully deployed an OS many times over the course of a month. Now, all of the sudden, when PXE booting we are seeing a Waiting for approval message. All other troubleshooting aside, my last ditch effort was to remove deployment-related content from the Distribution Point, remove the PXE role, restart the DP, enable PXE, and distribute content. No change.


The log on the DP shows the DHCP request, the boot image request and send and basically just repeats this section over and over, incrementing the SMSTemp var file number:
<![LOG[Packet: Operation: 2 (reply), AdrType: 1, AdrLen: 6, HopCount: 0, TransactID: 0001e240, BootTime: 65535, Addr: 00:15:5d:0d:86:06:00:00:00:00:00:00:00:00:00:00, HostName: , BootFile: smsboot\AZ100005\x64\bootmgfw.efi, ClientIP: 10.1.21.25, HostIP: 0.0.0.0, ServerIP: 10.1.15.115, RelayIP: 0.0.0.0
Options:
53, 1, MsgType: 05, ack
54, 4, SvrID: 0a 01 0f 73
97, 17, UUID: 00 70 0f 2b f1 dc a7 f8 49 a4 f6 80 9d 4e d0 ac 3a
60, 9, ClassID: PXEClient
243, 38, '': 02 00 01 16 53 4d 53 54 65 6d 70 5c 30 30 30 30 30 30 30 30 31 35 2e 76 61 72 03 0a 41 5a 30 31 53 43 43 4d 44 50
252, 32, '': 53 4d 53 54 65 6d 70 5c 41 5a 31 30 30 30 30 35 2d 30 30 30 30 30 2d 30 30 30 30 30 2e 62 63 64]LOG]!><time="11:23:08.805+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="836" file="pxeserver.cpp:288">
<![LOG[PXE: Sending reply to 10.1.21.25, PXE.]LOG]!><time="11:23:08.805+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="836" file="pxeserver.cpp:48">
<![LOG[Packet: Operation: 1 (request), AdrType: 1, AdrLen: 6, HopCount: 0, TransactID: 0001e240, BootTime: 65535, Addr: 00:15:5d:0d:86:06:00:00:00:00:00:00:00:00:00:00, HostName: , BootFile: , ClientIP: 10.1.21.25, HostIP: 0.0.0.0, ServerIP: 10.1.15.115, RelayIP: 0.0.0.0
Options:
93, 2, Arch: 00 07
97, 17, UUID: 00 70 0f 2b f1 dc a7 f8 49 a4 f6 80 9d 4e d0 ac 3a
53, 1, MsgType: 03, request
60, 9, ClassID: PXEClient
55, 9, ParamRequestList: 3c 80 81 82 83 84 85 86 87
250, 21, Extension: 0c 01 01 0d 02 08 00 01 02 00 07 0e 01 01 05 04 00 00 00 00 ff]LOG]!><time="11:23:29.658+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="8004" file="pxeserver.cpp:288">
<![LOG[PXE: Packet from 10.1.21.25 (PXE, 00:15:5D:18:16:06, 10.1.15.115).]LOG]!><time="11:23:29.658+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="8004" file="pxeserver.cpp:479">
<![LOG[PXE: 00:15:5D:0D:86:06: Operation=1, MessageType=3, Architecture=7, Continuation=1]LOG]!><time="11:23:29.658+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: Parsed a request (continuation) packet.]LOG]!><time="11:23:29.658+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: F12B0F70-A7DC-49F8-A4F6-809D4ED0AC3A: Client is 64-bit, UEFI, WDS.]LOG]!><time="11:23:29.658+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[SSL, using authenticator in request.]LOG]!><time="11:23:29.673+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10159">
<![LOG[In SSL, but with no client cert.]LOG]!><time="11:23:29.673+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10180">
<![LOG[SSL, using authenticator in request.]LOG]!><time="11:23:29.720+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10159">
<![LOG[In SSL, but with no client cert.]LOG]!><time="11:23:29.720+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10180">
<![LOG[Client Boot Get ID Info reply: <ClientIDReply><Identification Unknown="0" DuplicateSMBIOS="0" DuplicateMACAddress="0" ItemKey="0" ServerName=""><Machine><ClientID/><NetbiosName/></Machine></Identification><ClientIDInfo ItemKey="0" ClientID="" DuplicateSMBIOS="0" DuplicateMACAddress="0" MatchType="0"/></ClientIDReply>
]LOG]!><time="11:23:29.751+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:7738">
<![LOG[PXE: 00:15:5D:0D:86:06: System records:]LOG]!><time="11:23:29.751+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: 0, , SMBIOS ID is NOT a match, MAC Address is NOT a match.]LOG]!><time="11:23:29.751+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: No valid system records.]LOG]!><time="11:23:29.751+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: Client machine is UNKNOWN.]LOG]!><time="11:23:29.751+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[SSL, using authenticator in request.]LOG]!><time="11:23:29.783+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10159">
<![LOG[In SSL, but with no client cert.]LOG]!><time="11:23:29.783+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10180">
<![LOG[SSL, using authenticator in request.]LOG]!><time="11:23:29.814+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10159">
<![LOG[In SSL, but with no client cert.]LOG]!><time="11:23:29.814+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:10180">
<![LOG[Client Boot TS reply: <ClientIDReply><Identification Unknown="0" DuplicateSMBIOS="0" DuplicateMACAddress="0" ItemKey="2046820353" ServerName=""><Machine><ClientID/><NetbiosName/></Machine></Identification><TSInfo DeploymentID="AZ120016" PkgID="AZ1000A3" BootImageID="AZ100005" Architecture="9" Required="0" AlreadyRun="0" ForPXE="1" Disabled="0" PackageAvailable="1" FutureAvailability="0" Expired="0" UEFIArchitectureMismatch="0" ArchitectureMismatch="0"/></ClientIDReply>
]LOG]!><time="11:23:29.845+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="libsmsmessaging.cpp:7884">
<![LOG[PXE: 00:15:5D:0D:86:06: Task Sequence deployment(s) to unknown machines:]LOG]!><time="11:23:29.845+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: AZ120016, AZ100005, 64-bit, optional, is valid.]LOG]!><time="11:23:29.845+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[PXE: 00:15:5D:0D:86:06: Using Task Sequence deployment AZ120016.]LOG]!><time="11:23:29.845+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="mp.cpp:37">
<![LOG[Saving Media Variables to "SMSTemp\0000000016.var"]LOG]!><time="11:23:29.845+420" date="12-08-2020" component="SCCMPXE" context="" type="1" thread="1084" file="tsremovablemedia.cpp:186">

