In message <57E6EC20.70706 at mathemainzel.info> on Sat, 24 Sep 2016 23:12:00 +0200, "Walter H." <Walter.H at mathemainzel.info> said: Walter.H> Hello, Walter.H> Walter.H> what is correct: Walter.H> Walter.H> this: Walter.H> subjectAltName = DNS:www.example.com, IP:127.0.0.1, Walter.H> IP:[2001:db8:123::1] Walter.H> Walter.H> or this: Walter.H> subjectAltName = DNS:www.example.com, IP:127.0.0.1, IP:2001:db8:123::1 Walter.H> Walter.H> or the question in other words: do I have to put an IPv6 address of Walter.H> the subjectAltName in []-brackets? Without brackets. libcrypto will figure out that it's a IPv6 address from the presence of colons. Cheers, Richard -- Richard Levitte levitte at openssl.org OpenSSL Project http://www.openssl.org/~levitte/