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https://issues.apache.org/jira/browse/DERBY-6972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277974#comment-16277974
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Bryan Pendleton commented on DERBY-6972:
----------------------------------------
Or try 'strace' (Linux) or 'Process Monitor' (Windows) to gather more
information about how the JDK classes are interacting with the underlying
operating system APIs.
> Delay for getting derby connection (Connection Reset and Waiting for a
> connection)
> ----------------------------------------------------------------------------------
>
> Key: DERBY-6972
> URL: https://issues.apache.org/jira/browse/DERBY-6972
> Project: Derby
> Issue Type: Bug
> Components: Network Server
> Affects Versions: 10.11.1.1
> Reporter: Sridhar Jena
> Priority: Critical
>
> Hi Team,
> This is regarding a derby connection issue in network mode.
> We are using Apache derby in network mode. Below are the version we are using
> for client server communication,
> Client Jar Version : *derbyclient-10.13.1.1.jar*
> Server Version : * Apache Derby Network Server - 10.11.1.1*
> We are facing three types of connection issue while getting database
> connection from our java application.
> 1. A communications error has been detected: Connection reset
> 2. Waiting for a connection with a long period of time.
> 3. Error connecting to server 127.0.0.1 on port 1,527 with message connect
> timed out.
> At the same time if we are checking the derby.log in derby server, we found
> below exceptions,
> *Fri Oct 20 17:19:30 EDT 2017* Thread[DRDAConnThread_107,5,main] (DATABASE =
> null), (DRDAID = null), Execution failed because of a Distributed Protocol
> Error: DRDA_Proto_SYNTAXRM; CODPNT arg = 0; Error Code Value = 3. Plaintext
> connection attempt from an SSL enabled client?
> *Fri Oct 20 17:19:30 EDT 2017* : Execution failed because of a Distributed
> Protocol Error: DRDA_Proto_SYNTAXRM; CODPNT arg = 0; Error Code Value = 3.
> Plaintext connection attempt from an SSL enabled client?
> org.apache.derby.impl.drda.DRDAProtocolException: Execution failed because of
> a Distributed Protocol Error: DRDA_Proto_SYNTAXRM; CODPNT arg = 0; Error
> Code Value = 3. Plaintext connection attempt from an SSL enabled client?
> at org.apache.derby.impl.drda.DRDAConnThread.throwSyntaxrm(Unknown
> Source)
> at org.apache.derby.impl.drda.DDMReader.readDssHeader(Unknown Source)
> at
> org.apache.derby.impl.drda.DRDAConnThread.exchangeServerAttributes(Unknown
> Source)
> at
> org.apache.derby.impl.drda.DRDAConnThread.sessionInitialState(Unknown Source)
> at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
> We have no idea about the above Exceptions why it is coming while getting
> connection in java client application.
> Could you please help us to identify the exact reason for the above problem.
> Thanks & Regards,
> Sridhar Jena
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