This will not work for splunk self-service, the ECC certs that splunk uses are too strong, this is a known issue. However i would also suggest looking at the following post. http://stackoverflow.com/questions/31107851/how-to-fix-curl-35-cannot-communicate-securely-with-peer-no-common-encryptio Basically you specify the required cipher explicitly as an option. Now which one to specify, you figure this out by checking the ciphers on server. Okay I was able to fix this. So basically you understand that curl does not support even one of the ciphers that server is willing to negotiate. Note that the I was testing this on a ubuntu machine. curl that was present on my ubuntu machine was not using openssl. I think that the default curl that you get by doing sudo apt-get is not built with openssl. So I built curl following this post http://askubuntu.com/questions/764443/how-to-compile-curl-with-ssl-support After that I was able to make curl request. I also have a mac and I was able to make curl request successfully from there. I also had another colleague of mine who was not able to do so from mac. So I think a solution would be to build curl from source specifying an SSL library to build with ( this may depend on the os that you are using). Let me know how it goes. ... View more