While deploying the OMS Gateway for Windows Defender ATP, I encountered the following error in the event viewer of the OMS Gateway:

2020-02-28 13:19:05 [47] ERROR GatewayLogic – Target host (winatp-gw-uks.microsoft.com) is forbidden. Destination server is not in allowed list. Ensure that the Microsoft Monitoring Agent on your Gateway box and the agents talking to the Gateway, are both connected to the same Log Analytics workspace.

Windows Defender ATP

This error indicates that the OMS Gateway can’t communicate through the URL that is being provided. So, I looked into the inbound connections on the OMS Gateway server, and I saw that some servers had the TIME_WAIT status after I performed the netstat -an:

Windows Defender ATP

After some research, I found a PowerShell command, Add-OMSGatewayAllowedHost for the gateway. I authorized URLs that were present in the logs of the event viewer and I restarted the OMSGatewayService:

Add-OMSGatewayAllowedHost -Host winatp-gw-weu.microsoft.com -Force

Add-OMSGatewayAllowedHost -Host winatp-gw-cus.microsoft.com -Force

Add-OMSGatewayAllowedHost -Host winatp-gw-eus.microsoft.com -Force

Add-OMSGatewayAllowedHost -Host eu-v20.events.data.microsoft.com -Force

Add-OMSGatewayAllowedHost -Host v20.events.data.microsoft.com -Force

Add-OMSGatewayAllowedHost -Host settings-win.data.microsoft.com -Force

Restart-Service OMSGatewayService

OMSGatewayAllowedHost

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After restarting the service, I had no more errors:

No more errors

I hope that this short guide was able to help you. If you have any questions regarding the issue, be sure to leave a comment or text me and I will try and help if that’s within my reach.

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Florent Appointaire
Florent Appointaire is Microsoft Engineer with 5 years of experience, specialized in Cloud Technologies (Public/Hybrid/Private). He is a freelance consultant in Belgium from the beginning of 2017. He is MVP Cloud and Datacentre Management. He is MCSE Private Cloud and Hyper-V certified. His favorite products are SCVMM, SCOM, Windows Azure pack/Azure Stack and Microsoft Azure.
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