Confluence returns "Unable to retrieve JIRA metadata" message in linked JIRA issues dialog when accessed by unlicensed users

2017-02-02 15:49:26,956 ERROR [JIRAMetadataPlugin:thread-9] [metadata.jira.helper.JiraMetadataErrorHelper] printError Unknown error encountered while retrieving JIRA metadata. Please check the logs.
– referer: https://jirajirajira/display/keykey/pagepagepage | url: /rest/jira-metadata/1.0/metadata | traceId: 39600d04bc6dc2d0 | userName: useruseruser
org.apache.http.client.ClientProtocolException
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at com.atlassian.sal.core.net.HttpClientRequest.executeAndReturn(HttpClientRequest.java:95)
at com.atlassian.plugins.rest.module.jersey.JerseyRequest.executeAndReturn(JerseyRequest.java:131)
at com.atlassian.applinks.core.auth.ApplicationLinkRequestAdaptor.executeAndReturn(ApplicationLinkRequestAdaptor.java:53)
at com.atlassian.applinks.oauth.auth.OAuthApplinksReturningResponseHandler.handle(OAuthApplinksReturningResponseHandler.java:45)
at com.atlassian.plugins.rest.module.jersey.JerseyRequest$2.handle(JerseyRequest.java:134)
at com.atlassian.sal.core.net.HttpClientRequest.executeAndReturn(HttpClientRequest.java:96)
at com.atlassian.plugins.rest.module.jersey.JerseyRequest.executeAndReturn(JerseyRequest.java:131)
at com.atlassian.applinks.core.auth.ApplicationLinkRequestAdaptor.executeAndReturn(ApplicationLinkRequestAdaptor.java:53)
at com.atlassian.applinks.oauth.auth.OAuthRequest.executeAndReturn(OAuthRequest.java:84)
at com.atlassian.applinks.core.auth.AbstractApplicationLinkRequest.execute(AbstractApplicationLinkRequest.java:114)
at com.atlassian.confluence.plugins.metadata.jira.service.JiraIssuesMetadataDelegate.getGroups(JiraIssuesMetadataDelegate.java:58)
at com.atlassian.confluence.plugins.metadata.jira.service.helper.SingleAppLinkMetadataHelper$2.call(SingleAppLinkMetadataHelper.java:133)
at com.atlassian.confluence.plugins.metadata.jira.service.helper.SingleAppLinkMetadataHelper$2.call(SingleAppLinkMetadataHelper.java:125)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.http.ProtocolException: Target host is not specified
at org.apache.http.impl.conn.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.java:70)
at org.apache.http.impl.client.InternalHttpClient.determineRoute(InternalHttpClient.java:124)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:183)
... 18 more