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28 Apr
2023

The underlying connection was closed: An unexpected error occurred on a send.

by Shubham Batra

172

At the beginning of the application, add this code:

Constant 768 means TLS 1.1 security protocol and constant value 3072 means TLS 1.2.

ServicePointManager.SecurityProtocol = (SecurityProtocolType)768 | (SecurityProtocolType)3072;

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  • The underlying connection was closed: An unexpected error occurred on a send , HOW TO ENABLE TLS V12 IN NET FRAMEWORK 40

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