From the ext. name it seems that your cert and key are in DER format. The default of CURLOPT_SSLCERTTYPE and CURLOPT_SSLKEYTYPE is "PEM". You can try to set these two options to "DER".
Roy On Monday, February 28, 2022, 10:10:07 p.m. EST, Venkat Maddisetti via curl-library <curl-library@lists.haxx.se> wrote: Hi, I am using libcurl to Interface a 3rd party application that uses standard protocol HTTPS version 2 with client and server x.509 certificates and TLS v1.3 for authentication and encryption, and was provided with “.crt” and “.key” files. I am setting option with CURLOPT_SSLCERT and CURLOPT_SSLKEY with those files but fails to establish connection. I looked at the curl documentation and on SSLCERTTYPE page there is a mention of just using PEM/DER that makes me think I am lost and seek some help from curl community. My Curl Version is libcurl/7.73.0 and OpenSSL/1.1.1 curl_easy_setopt(curl, CURLOPT_PORT, 3001); curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0); curl_easy_setopt(curl, CURLOPT_USERAGENT, "Go-http-client/2.0"); curl_easy_setopt(curl, CURLOPT_SSLCERT, "./abc_lh.crt"); curl_easy_setopt(curl, CURLOPT_SSLKEY, "./abc_lh.key"); curl:9b65b480, curlhandle:9b65b480 * STATE: INIT => CONNECT handle 0x2289b65b480; line 1796 (connection #-5000) * Added connection 0. The cache now contains 1 members * family0 == v4, family1 == v6 * Trying 192.168.11.200:3001... * STATE: CONNECT => WAITCONNECT handle 0x2289b65b480; line 1857 (connection #0) * connect to 192.168.11.200 port 3001 failed: Connection refused * Failed to connect to 192.168.11.200 port 3001: Connection refused * multi_done * The cache now contains 0 members * Closing connection 0 Error: Couldn't connect to server failed to create curl request -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html
