I have been trying to enable SSL on my courier IMAP server running Ubuntu 14.04. I installed courier-ssl
and courier-imap-ssl
. Then the server stopped working completely, with an "authentication error" in Rainloop webmail. This happens regardless of whether or not the courier-imap-ssl
service is started, and is resolved if and only if courier-ssl
is uninstalled.
What could be the problem here, and how would I go about enabling SSL?
With courier-ssl
installed and courier-imap-ssl
running, I get this error if I run openssl s_client -connect localhost:993
:
CONNECTED(00000003)
write:errno=104
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 305 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1.2
Cipher : 0000
Session-ID:
Session-ID-ctx:
Master-Key:
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
Start Time: 1463335379
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
And this error if I run telnet localhost 993
:
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Connection closed by foreign host.