Problem

The JS7 can be configured to send e-mail JS7 - Notification in case of successful or failed execution of jobs and workflows. A number of errors can indicate that this connection does not work:

javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
javax.mail.MessagingException: Could not connect to SMTP host: mail.example.com, port: 587

javax.net.ssl.SSLException: Unsupported or unrecognized SSL message
javax.mail.MessagingException: Could not connect to SMTP host: mail.example.com, port: 587

The error messages are raised by the JOC Cockpit JS7 - Monitor Service when trying to send mail. They can be found in the service-monitor.log file, see JS7 - Log Files and Locations.

Analysis

There are a larger number of screws that users can turn. It is important to narrow down the problem in a systematic way and not to turn too many screws at the same time.

Determine Port Usage

Mail servers frequently use specific ports per type of connection, however, technically any port can be used. Your system administrator should this information:

Below examples check availability of port 587:

# should telnet be available
telnet mail.example.com 587

# should nc or ncat be available
ncat -v -u mail.example.com 587

# 
curl --ssl --url mail.example.com

Test-NetConnection -ComputerName mail.example.com -Port 587

Certificate Management

openssl s_client -showcerts -connect mail.example.com:465

Specify Authentication

x

Solution