DER format is fine for certificates. But then, many things can go wrong with SSL. To find out what happens to your certificate switch on SSL debugging by setting $IO::Socket::SSL::DEBUG=2 in your code - see IO::Socket::SSL. It is a bit verbose, but should clearly indicate whether your client certificate has been used for the request.

In reply to Re: Issue with LWP loading client certificate by haj
in thread Issue with LWP loading client certificate by ffrost

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