I am really not sure about this one. Keeping this thread open.
Prajwal thank you for your interest.
I have received new data.
After further reading the logs and analyzing the situation, I noticed that the distribution points are different.
In the first domain, the DP volume is 135 GB.
In a trusted domain of 60 GB.
Although the distributed set of software and updates is the same.
I thought that this was the 404 error when receiving updates on a trusted domain.
I ran a content check on dp in a trusted domain, the volume increased by 15 GB. However, updates were still unavailable and the 404 error remained.
I made the decision to remove and install DP.
I did this and also enabled the branchcache and ledbat functions.
After full synchronization, both DP became the same!
After performing these actions, part of the PC was able to download and install updates, and the 404 error disappeared.
But at the same time, the errors in the data transfer log and download log disappeared!
However, on some other PCs, when trying to download and install updates, such errors appeared.
WUAHandler
OnSearchComplete - Failed to end search job. Error = 0x8024b304.
Scan failed with error = 0x8024b304.
and in the wsus ReportingEvents service log
{9527D43B-CEA2-4C66-9414-31DFE344B25E} 2021-12-14 18:16:32:925+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.29.0.0.3.0
{824CA874-356C-480A-B115-27B5D0F66578} 2021-12-14 18:16:33:879+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.30.0.0.3.0
{4D4F6FDD-FE8B-4E18-B78B-E0992A64291D} 2021-12-14 20:03:25:145+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.31.0.0.3.0
{621707EA-D158-45A5-9B62-D3E8BC4C7DE8} 2021-12-14 20:03:26:282+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.32.0.0.3.0
{6D485AB1-D306-4F4A-9351-258FE0061932} 2021-12-14 20:03:27:326+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.33.0.0.3.0
{4474A0F4-A015-4DDB-9172-B596933F18E1} 2021-12-14 23:40:01:680+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.34.0.0.3.0
{37D4207F-A0B3-4056-8759-7EA12B8FF380} 2021-12-14 23:49:07:321+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.35.0.0.3.0
{0F00DD2D-D746-4A56-AF05-7AE0B6A9B49E} 2021-12-15 01:00:02:315+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.36.0.0.3.0
{F72A202D-1C04-4258-A3FA-04C50199B68A} 2021-12-15 05:24:36:707+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 UpdateOrchestrator Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. eebcIuq8qE2xZxY6.1.1.0.0.3.0
{8A9C273A-C962-4A62-B74E-F126DD6FDD48} 2021-12-15 09:15:22:256+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.37.0.0.3.0
{10E61DBA-2862-4853-857B-AD08045C1E50} 2021-12-15 09:15:23:318+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.38.0.0.3.0
{054B2DEC-3843-4EAC-B653-47D930089A75} 2021-12-15 09:15:24:292+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.39.0.0.3.0
{65814683-C978-4054-A905-7E2B142E1F02} 2021-12-15 09:15:25:329+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.40.0.0.3.0
{23EB53AE-DF7D-4E75-908F-D2AF12CC921C} 2021-12-15 09:15:26:480+0300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 8024b304 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x8024b304. M7CB4GwRkUav2G21.41.0.0.3.0
and in the updatedeployment log
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11796 (0x2E14)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
Failed to get update (Site_DFB45D21-7C5B-413C-BAD0-4902D5AB7566/SUM_55a5c14f-60cb-4839-90ba-650ba6f178f0) Article Id, error = 0x87d00215 UpdatesDeploymentAgent 15.12.2021 9:15:24 11724 (0x2DCC)
But at the same time, the errors in the data transfer log and download log disappeared!
These are unknown errors for. A Google search did not give any special results.