That's true for DER files, but not for all certificate formats (PEM and PKCS#12 can have both key and certificate rolled into one file). But if that was the problem, then IO::Socket::SSL would complain loudly and the handshake wouldn't complete. So I rather guess that the server didn't request a client certificate.

In reply to Re^2: Issue with LWP loading client certificate by haj
in thread Issue with LWP loading client certificate by ffrost

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