iOS 9.3 : An SSL error has occurred and a secure connection to the server cannot be made

Question

I am getting following error with self signed certificate

Error Domain=NSURLErrorDomain Code=-1200 \"An SSL error has occurred and a secure connecti

Answer 1

At the command-line in OS X, run the following:

nscurl --ats-diagnostics https://filename.hostname.net --verbose

This will tell you what combinations of ATS settings will and will not permit iOS to access your site, and should point you towards what is wrong with your site.

It could be one or more of the following

• Certificate hash algorithm (must be SHA-256 or above)
• TLS version (must be 1.2)
• TLS algorithms (must provide Perfect Forward Secrecy)