Transcription of 2 This particular error was seen in
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2 This particular error was seen in
INDEX F/B error F/B direction Causes Troubleshooting suggestions or possible resolutions 1 Proxy web request failed. , inner exception: An internal server error occurred. The operation failed. LID: 59916 If you also Test-OauthConnectivity for EWS On-Premises endpoint (for autoD endpoint might be successful), you will see the following 500 Internal Server error : Test-OAuthConnectivity -Service EWS -TargetUri https://<On-Premises EWS URL>/ -Mailbox <Cloud Mailbox> : The remote server returned an error : (500) Internal Server error . Cloud to On-Premises (Exchange 2016 CU8) A known Exchange OAUTH issue This was seen in Exchange 2016 CU8 (considered old now) and fixed in CU9. Please note that in a hybrid deployment, you should always install latest CU or the immediately previous CU. More info about this particular issue here. If you are running another Exchange Server Version (CU/ RU), please check if your Exchange Services are up and running (including EWS and AutoD Application Pools).
More info about this particular issue here. If you are running another Exchange Server Version (CU/ RU), please check if your Exchange Services are up and running (including EWS and AutoD Application Pools). You would make sure that you can browse the EWS and Autodiscover URLs and that you see the requests coming in IIS logs with 500 HTTP Status.
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