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The XProtect Recording Server must be able to reach the Management Server to complete the startup process in the event the local (also known as “offline”) configuration is missing or corrupt. Here are some tips to troubleshoot why the Recording Server cannot reach the Management Server.

1. The Management Server address was entered incorrectly. Stop the Recording Server service, then right-click on the Recording Server notification tray icon, and click “Change Settings”. Verify that the IP, hostname, or fully qualified domain name entered here for the Management Server is correct and reachable from this system. The Management Server port is, by default, TCP 9993 so you must ensure the Recording Server can make an outbound TCP connection to the address provided for the Management Server, and also that the Management Server can receive inbound TCP connections on this port. Note (13-Sep-2020): Port 9993 is the default one in XProtect 2018 R3 and older versions; in 2019 R1 and newer the port is 9000.)]. [Note (2-Aug-2023): Confirm that port 9000 in Management Server is opened and reachable from the Recording Server Machine. Also, that port 9001 in the Recording Server is opened and reachable from the Management Server machine. To do so, use the TELNET command. If you find that ports 9000 and/or 9001 are being used by another process, please check KB 33844 . If for any reason you cannot uninstall the conflicting software, follow KB 33247 for changing the ports used by XProtect.]
2. If the Management Server address and port are correct, the problem might be that the Recording Server is unable to convert the address to an IP. This is typically due to the absence or incorrect configuration of a DNS server on the network. Work with the network administrator responsible for the network to correct the DNS issue.
3. If the problem persists, check the Windows Firewall on both the Management and Recording Server, and any other network security software or appliances to ensure the Recording Server can communicate with the Management Server.
4. If there is an indication of missing/corrupt installation files, consider re-running the installer for the Recording Server.
5. Check Time Synchronization between the Recording Server and the Management Server as this can also stop the Recording Server from pulling the configuration (if the time is not perfectly synced). [Note (2-Aug-2023): To double check and confirm the time sync is indeed correct, you can do the following, both in the Management Server and Recording Server machines:
   • In Settings – Time and Language, make sure that “Set time zone automatically” is set to Off.
   • In Control Panel → Clock and Region → Change the time zone, click on the button “Change time zone…”. Check now that, when enabling and disabling the option “Automatically adjust clock for Daylight Saving mode”, the time in the Management Server and Recording Server are the same. The option must remain enabled but, if one of of the machines has an incorrect time, manually change it by clicking on the “Change date and time…” button.

Note (29/11/2019): There might be one more reason why a remote Recording Server cannot connect to the Management Server. If the cumulative patch is installed on the VMS system and you attempt to install an additional Recording Server on a remote machine, it will not start if the Recording Server cumulative patch is installed. Basically, a difference in one or more of the installed XProtect DLL’s (due to the cumulative patch being applied) may be the root cause why the Recording Server and the Management Server cannot communicate. The most important thing to remember is: the same version of the cumulative patch should be installed on all servers (Management Server, Recording Server(s), etc.), or various issues may occur.
Note (2/08/2023): It can also happen that the Management Server cannot retrieve the license correctly. This can be checked in the Management Client, going to the License Information menu. If you get an error saying “Cannot read the received license information.”, please check KB 35161.

منبع : https://developer.milestonesys.com/s/article/Configuration-is-either-invalid-or-missing