OpenSSL ssl routines::no protocol available when running curl on Windows

279 views Asked by Klaus Nji At 03 June 2023 at 03:33

Attempting to execute this curl command on Windows legacy (2012) to use TLS 1.0 as follows:

curl -v -i --tlsv1.0 --tls-max 1.0 https://localhost:8443

And I get this error:

OpenSSL 3.1.0: error 0A0000BF::SSL routines::no protocols available. I have tried modifying the openssl configuration by adding this at the end.

[openssl_init]
ssl_conf = ssl_sect

[ssl_sect]
system_default = system_default_sect

[system_default_sect]
CipherString = DEFAULT@SECLEVEL=0

and this

openssl_conf = openssl_init

at the very top but this did not help. It is almost as if TLS 1.0 support has been completely removed from this version of curl (8.1.2).

Any thoughts?

TechQA.