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sharepoint - WCF: An existing connection was forcibly closed by the remote host

I built an addin for MS Project, this worked perfectly but for the two weeks, when I have tried to launch MS Project in DEV, I have the following error message:

Connection failed: An error occurred while making the HTTP request to https://mysharepointsite/projects//_vti_bin/WCF/Services.Name2017.PSIExtension.svc. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.

If I work on the test server, the addin works perfectly but when I launch Project from my computer, I have the error message (and once again, only in DEV)

I just have this error with the DEV server, on the PROD, I don't have this issue the server are aligned for the update and I checked the TLS and they use the same: TLS 1.2, AES with 128 bit encryption (High); ECDH with 256 bit exchange I can reach the webservice via webservice via my client machine

Any idea of what I could do?

Thank you for your help

Edit I'm not able to tracking my wcf but I use Fiddler and I catch the following error message: fiddler.network.https> HTTPS handshake to websites (for #30) failed. System.IO.IOException Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. < An existing connection was forcibly closed by the remote host

Once again, thank you for your help

question from:https://stackoverflow.com/questions/66046524/wcf-an-existing-connection-was-forcibly-closed-by-the-remote-host

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