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Small and medium business | Business Central, N...
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Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'

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Issue
HttpClient call fails with: " The SSL connection could not be established, see inner exception.Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'.The message received was unexpected or badly formatted." in version 25, SaaS environment. In Postman the same call works without problems.
 
I'm trying to call API with POST method
  Client.Post(URL,RequestContent, ResponseMsg);
   
Expected behavior
The HttpClient call succeeds.
 
 
Actual behavior
The HttpClient call fails with the following 
" The SSL connection could not be established, see inner exception.Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'.The message received was unexpected or badly formatted."

Versions:
AL Language: V14
Visual Studio Code:
Business Central: 25.0.23364.25412 (SaaS)
Operating System: Windows
 
I have the same question (0)
  • Suggested answer
    Khushbu Rajvi. Profile Picture
    18,966 Super User 2025 Season 2 on at
  • xgaronnat Profile Picture
    40 on at
    Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'
    Did you try to call the API with PostMan, curl or PowerShell ? (outside of BC)

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