Hello,

We will try to replicate the case.

In the meantime, you can look for more information.
The error message in the server log is indeed generic, but details should be available in the connector log.
The connector log configuration is in "Lightstreamer_JMS_Extender/jms_connectors/jms_connectors_log_conf.xml".
With the factory configuration you should find a "JMS_Extender.log" file in the "Lightstreamer_JMS_Extender/logs" folder.
You can also extend the configuration by setting TRACE level on the main "JMSExtenderLogger" logger.

Further information can be achieved by getting a stack dump of the whole server while it is waiting;
for instance with: jcmd <pid> Thread.print
Then, look for "Autodiscovery Thread".
You could increase the "connect_timeout_millis" property to simplify this operation.