What does error code 43550 mean from EWS?

Question

What does error code 43550 mean from EWS?

Elyes Graba 61

When trying to authenticate requests to EWS using an oauth access token with the EWS.AccessAsUser.All scope and the aud claim set to https://outlook.office.com, I am receiving a 500 response with the following response body: <html><body><b>Http/1.1 Internal Server Error 43550 </b></body> </html> What does the error code 43550 mean? I am struggling to find documentation on it online

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-04-11T06:54:26.3366667+00:00

Hi,

Welcome to Microsoft Q&A forum.

According to your description, seems that your issue is more related to development.

So, in order to better resolve your issue, I will add the tag “Exchange server development”.

Thanks for your understanding and hope your issue would be resolved soon.
Glen Scales 4,446 Reputation points

2023-04-11T23:31:32.4966667+00:00

That doesn't look like an EWS error as EWS generally won't send a html response to a SOAP post, have you got a Netscaler (or any other proxies) in the network path ?
Tunrip 85 Reputation points

2023-04-13T12:45:36.6933333+00:00

We've encountered the same problem. A number of others using the EWS Managed API have encountered problems due to this issue: https://github.com/OfficeDev/ews-managed-api/issues/294 I also note someone on StackOverflow has encountered the same problem: https://stackoverflow.com/questions/76004813/exchange-web-service-ews-gives-internal-server-error-in-the-middel-of-successf Something seems to have changed (or broken) in the EWS API over the last few days which plops this internal server error straight in the middle of the FindFolders results, causing malformed XML and breaking the response format.

Your answer

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-04-11T06:54:26.3366667+00:00

Hi,

Welcome to Microsoft Q&A forum.

According to your description, seems that your issue is more related to development.

So, in order to better resolve your issue, I will add the tag “Exchange server development”.

Thanks for your understanding and hope your issue would be resolved soon.
Glen Scales 4,446 Reputation points

2023-04-11T23:31:32.4966667+00:00

That doesn't look like an EWS error as EWS generally won't send a html response to a SOAP post, have you got a Netscaler (or any other proxies) in the network path ?
Tunrip 85 Reputation points

2023-04-13T12:45:36.6933333+00:00

We've encountered the same problem. A number of others using the EWS Managed API have encountered problems due to this issue: https://github.com/OfficeDev/ews-managed-api/issues/294 I also note someone on StackOverflow has encountered the same problem: https://stackoverflow.com/questions/76004813/exchange-web-service-ews-gives-internal-server-error-in-the-middel-of-successf Something seems to have changed (or broken) in the EWS API over the last few days which plops this internal server error straight in the middle of the FindFolders results, causing malformed XML and breaking the response format.

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What does error code 43550 mean from EWS?

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