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chrisME-6053 avatar image
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chrisME-6053 asked CryptoCoder-2806 answered

NETLOGON Event ID 5816 & 5817

Hello everyone

We're experiencing some authentication issues with our 2k19 exchange servers.

id 5817: "Netlogon has failed an additional 129 authentication requests in the last 30 minutes. The requests timed out before they could be sent to domain controller \\server.ourdomain.local in domain OURDOMAIN. Please see http://support.microsoft.com/kb/2654097 for more information."

the result is that outlook clients lost their connection to exchange server, and is automatically solved after 10 minutes.
we are facing the problem 1x / week

Any ideas how to solve it?

office-exchange-server-administration
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Hi @chrisME-6053,

Just checking in to see how things are going on with this issue. Have you already tried the solution provided by DSPatrick? If it works, it'd be appreciated that you can accept his post as answer to close this up. If you still need help on this, please feel free to post back for further discussion.


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DSPatrick avatar image
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DSPatrick answered DSPatrick commented

You may need to tweak the MaxConcurrentApi
https://docs.microsoft.com/en-us/troubleshoot/windows-server/windows-security/performance-tuning-ntlm-authentication-maxconcurrentapi

--please don't forget to Accept as answer if the reply is helpful--


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thx for reply
this has to be done on exchange server or domain controller?

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It may be on multiple servers that are involved.




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DSPatrick avatar image
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DSPatrick answered

Just checking if there's any progress or updates?

--please don't forget to upvote and Accept as answer if the reply is helpful--


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CryptoCoder-2806 avatar image
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CryptoCoder-2806 answered

Hi, I also having same issue with my sql server running on win2kR2 but MaxConcurrentApi is not present
should I configured it and edit the value

Netlogon has failed an additional 7 authentication requests in the last 30 minutes. The requests timed out before they could be sent to domain controller \\server.ourdomain.org in domain. Please see http://support.microsoft.com/kb/2654097 for more information.

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