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JMS Messaging Modular Input 1.7.2 - Connection poller error: Connection refused

Observer

We are trying to get the JMS inputs to work (connecting to MQ Series) but when the jms.py script is launched to initialise the modular input, we get the following java exception:
Error executing modular input : Connection refused (Connection refused) : java.lang.RuntimeException: Connection refused (Connection refused)
at com.splunk.HttpService.send(HttpService.java:370)
at com.splunk.Service.send(Service.java:1268)
at com.splunk.HttpService.get(HttpService.java:151)
at com.splunk.Entity.refresh(Entity.java:381)
at com.splunk.Entity.refresh(Entity.java:1)
at com.splunk.Resource.validate(Resource.java:174)
at com.splunk.Entity.validate(Entity.java:462)
at com.splunk.Entity.getContent(Entity.java:157)
at com.splunk.Entity.getString(Entity.java:279)
at com.splunk.ServiceInfo.getVersion(ServiceInfo.java:155)
at com.splunk.modinput.ModularInput.runStateCheckerThread(Unknown Source)
at com.splunk.modinput.ModularInput.init(Unknown Source)
at com.splunk.modinput.jms.JMSModularInput.main(Unknown Source)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)
at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
at sun.net.www.protocol.https.HttpsClient.(HttpsClient.java:264)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConne...
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.jav...
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:167)
at com.splunk.HttpService.send(HttpService.java:367)
... 12 more
The java command that produces the exception is:
['/usr/lib/jvm/jre-1.8.0/bin/java', '-classpath', '/opt/splunk/etc/apps/jms_ta/bin/lib/*', '-Xms64m', '-Xmx64m', '-Dsplunk.securetransport.protocol=tls', '-Dsplunk.logging.level=INFO', 'com.splunk.modinput.jms.JMSModularInput', '\n\n XXXXXXXX\n https://10.10.10.10:8089\n epqigvRtJ3ZebVjWyp4d^C965IlejTAKbdt3i5CCbcTnapuYMWFO8zyK9kzINFwbYnfC\n /opt/splunk/var/lib/splunk/modinputs/jms\n \n \n ...

The java command with the "--scheme" option works fine:
['/usr/lib/jvm/jre-1.8.0/bin/java', '-classpath', '/opt/splunk/etc/apps/jmsta/bin/lib/*', '-Xms64m', '-Xmx64m', '-Dsplunk.securetransport.protocol=tls', '-Dsplunk.logging.level=INFO', 'com.splunk.modinput.jms.JMSModularInput', '--scheme']
08/20/2019 17:19:14 - root - INFO - Java process output is INFO Initialising Modular Input
INFO Getting scheme
INFO Data sent to Splunk:
JMS Messaging
Poll messages from queues and topics
<use
externalvalidation>true</useexternalvalidation>
<streaming
mode>xml
true



JMS queue or topic
...

Any idea what could be wrong here?

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