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Problem report
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    Resolution: Fixed
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Major
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    4.0.3
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    None
 
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        Sprint 50 (Mar 2019), Sprint 51 (Apr 2019)
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        0.25
 
Same as in: ZBX-14585
Another set of java-gateway log lines missing information to identify source of problem:
2019-01-04 07:55:35.328 [pool-1-thread-4] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection refused: service:jmx:remoting-jmx://10.1.1.1:10840 2019-01-04 07:55:47.601 [pool-2-thread-23] WARN org.jboss.remotingjmx.Util - The protocol 'remoting-jmx' is deprecated, instead you should use 'remote'.
Better to add IP/DNS and item key information to the error log messages.