Getting read ECONNRESET error while calling https://apitest.cybersource.com/microform/v2/sessions

[pp_sandbox]

Getting read ECONNRESET error while calling https://apitest.cybersource.com/microform/v2/sessions through postman or c# code. However with the same request header and body using cybersource Rest client, provided by cybersource, I am able to see the response as expected. Please be noted that I have Key, secret key and merchant id for sandbox account. What could be the possible reason.

[Keelyredina]

The `ECONNRESET` error during calls to `https://apitest.cybersource.com/microform/v2/sessions` suggests a connection reset by the server. Possible reasons include firewall/network issues, TLS/SSL misconfigurations, proxy problems, header/body inconsistencies, rate limiting, or API endpoint errors. Ensure correct TLS/SSL settings, validate headers/body, and check for rate limits. If using a proxy, configure it correctly. Contact Cybersource support for assistance and verify network/firewall configurations. If the Cybersource Rest client works, compare its settings with Postman or C# code to identify discrepancies.