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Indeed the <param name="first_connection_timeout_millis"> parameter is not mandatory for the <metadata_provider> section.
But its default value is -1, which means endless waiting. This is because,...

The log that you posted shows that the Lightstreamer Server startup procedure has never finished. Indeed it is waiting for Remote Metadata Adapter connections.
Please note that in case of Remote...

The isuue that you describe is actually quite strange. The first step we can take is raise the log level of these 3 categories (you find them in the LS_HOME/conf/lightstreamer_log_conf.xml):
...