Contents
1. openssl s_client
https://www.openssl.org/docs/man3.0/man1/openssl-s_client.html
openssl-s_client - SSL/TLS client program
1.1. history
openssl s_client -connect gmail-smtp-in.l.google.com:487
返事がないのは、設定不足か。
$ openssl s_client -connect conoha.qmail.jp:25 Connecting to 157.7.113.173 CONNECTED(00000003) 80AB3596B37F0000:error:0A00010B:SSL routines:tls_validate_record_header:wrong version number:ssl/record/methods/tlsany_meth.c:80: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 5 bytes and written 323 bytes Verification: OK --- New, (NONE), Cipher is (NONE) This TLS version forbids renegotiation. Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok)
starttls 220 ready for tls mail from tmaeno 454 TLS connection failed: error:0A00010B:SSL routines::wrong version number (#4.3.0) Connection closed by foreign host.