Issue With OMS Gateway

Question

Issue With OMS Gateway

Srivastava, Nandan (CSCB RPS) 11

Hi,

I am trying to install OMS agent on windows 2016 server. When I am using http proxy during agent installation then my server able to connect with workspace.
But when I am trying to deploy the same with OMS gateway, It's giving me authentication error.

2020-08-05T22:26:14.8138583+05:30 Debug: X-Request-ID : e767b5fc-f3b5-4188-bdfb-704bed957e9e
2020-08-05T22:26:15.0188580+05:30 Error: Exception reading server response, will use default response : System.Xml.XmlException: Root element is missing.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space)
at Microsoft.MOMv3.Setup.MOMv3ManagedCAs.TryReadServerResponse(HttpWebResponse response)
2020-08-05T22:26:15.0188580+05:30 Debug: Failed to authenticate
2020-08-05T22:26:15.0438579+05:30 Debug:

* Trace Ended *

For OMS gateway I configured it on my separate VM which has connectivity to internet and VM where I am trying to install agent is isolated and in proxy setting providing OMS gateway details.

Help me out to fix this issue.

bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-06T04:08:27.273+00:00

Thank you @Srivastava, Nandan (CSCB RPS) for reaching out. Can you please confirm if you are seeing any errors in in the event logs when you are trying to install the agent, if yes can you please share any specific event logs you are seeing which might help further isolate the issue.
bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-07T00:01:22.63+00:00

@Srivastava, Nandan (CSCB RPS) Can you please share more information so that we can help further troubleshoot the issue ? thank you
Srivastava, Nandan (CSCB RPS) 11 Reputation points

2020-08-07T07:19:30.233+00:00

@bharathn-msft Thanks for your response. Attached the error. It is saying either workspace key issue or time synchronization problem.
When I am trying to install agent on VM with http proxy directly then its able to install but if I use oms gateway detail instead of proxy then only facing this issue.
bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-09T20:09:53.14+00:00

@Srivastava, Nandan (CSCB RPS) Thank you for providing additional information. Will review further and get back to you at the earliest.

We will use the comment section to get further details and troubleshoot, once we have an answer will update the Answer section of the thread. Thank you

1 answer

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bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-06T04:08:27.273+00:00

Thank you @Srivastava, Nandan (CSCB RPS) for reaching out. Can you please confirm if you are seeing any errors in in the event logs when you are trying to install the agent, if yes can you please share any specific event logs you are seeing which might help further isolate the issue.
bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-07T00:01:22.63+00:00

@Srivastava, Nandan (CSCB RPS) Can you please share more information so that we can help further troubleshoot the issue ? thank you
Srivastava, Nandan (CSCB RPS) 11 Reputation points

2020-08-07T07:19:30.233+00:00

@bharathn-msft Thanks for your response. Attached the error. It is saying either workspace key issue or time synchronization problem.
When I am trying to install agent on VM with http proxy directly then its able to install but if I use oms gateway detail instead of proxy then only facing this issue.
bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-09T20:09:53.14+00:00

@Srivastava, Nandan (CSCB RPS) Thank you for providing additional information. Will review further and get back to you at the earliest.

We will use the comment section to get further details and troubleshoot, once we have an answer will update the Answer section of the thread. Thank you

Answer 1

Srivastava, Nandan (CSCB RPS) 11

@bharathn-msft I am able to fixed this issue. Actually I got to know from windows event error.

2020-08-07 20:34:43 [16] ERROR GatewayLogic - Target host (d982aa04-730a-441f-a059-e19097351d4d.oms.opinsights.azure.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.

So what hint I got to know from above error that I need to install monitoring agent on OMS gateway as well with same id and key. If I see documentation part from Microsoft that part is completely missing and no where mention in OMS gateway deployment that I need to install agent on gateway as well. So when I install agent on gateway with same id and key after that able to install on other VM.

bharathn-msft 5,106 Reputation points Microsoft Employee Moderator

2020-08-10T18:22:38.703+00:00

@Srivastava, Nandan (CSCB RPS) Glad to hear that based on event view logs you were able to figure out the issue and solve and we really appreciate you taking time to circle back on this thread and sharing with the community members here.

Thanks for feedback on the documentation improvement, we will work with respective document authors and see how we can enhance the documentation to cover this scenario.

Feel free to revert back if you have any queries in future. Thank you
Roggenbuck, Julie 0 Reputation points

2023-02-14T20:49:45.2433333+00:00

open powershell (as admin) and run this command on your OMS Gateway servers

Add-OMSGatewayAllowedHost -host d982aa04-730a-441f-a059-e19097351d4d.oms.opinsights.azure.com -force

Restart-Service OMSGatewayService

I just got off a Microsoft call with that very error in my event logs

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Issue With OMS Gateway

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