can you please grab the jenkins.log just after trying to import the job and upload to the jira?

Same here. But no any logs is apeared during operation.

Client Jenkins  version: 2.150.3

Remote Jenkins version: 2.150.1

Job Import Plugin: 3.1

I ran into exactly this problem today with plugin v3.2... when trying to actually use the plugin, the page would just refresh (without displaying an error) whenever "query!" was clicked.

For me, the problem turned out to be with credentials... the correct permissions had not been set up on the remote Jenkins server.

I have logged an enhancement JENKINS-56908 to "Provide a "Test Connection" button to plugin configuration"

Mark, what permissions did you need to add on the remote Jenkins? A colleague was attempting to use this plugin and was having same issue (nothing happened, no logs). I discovered that she had not been using the right credentials in the host Jenkins configuration.  Once I fixed that, it finally started logging, but now I'm getting one of 2 errors, either: 

{{I/O exception (java.net.NoRouteToHostException) caught when processing request to {}->http://<remote-server>:8080: No route to host (Host unreachable)
May 10, 2019 11:51:18 PM INFO org.apache.http.impl.execchain.RetryExec execute
Retrying request to {}->http://<remote-server>:8080
May 10, 2019 11:51:18 PM SEVERE org.jenkins.ci.plugins.jobimport.client.RestApiClient getRemoteItems
Failed to list job from remote http://<remote-server>:8080/
java.net.NoRouteToHostException: No route to host (Host unreachable)}}

With a long stack trace, or:

{{Failed to list job from remote /
java.net.MalformedURLException: no protocol: /api/xml?tree=jobs[name,url,description]}}

With a long stack trace.

I can ping the remote from the host, so I know it can "see" it.