There is an error "is this a private repository ? " when I configure the Git integration for JIRA, could you figure out the reason ?

the detail info is as follows:
com.bigbrassband.jira.git.exceptions.external.CantConnectToGitLabException: External service error at com.bigbrassband.jira.git.services.integration.gitlab.CachedGitLabApi.<init>(CachedGitLabApi.java:87) at com.bigbrassband.jira.git.services.integration.gitlab.GitLabApiService.validate(GitLabApiService.java:162) at com.bigbrassband.jira.git.services.async.ScanTrackedRepoTask.run(ScanTrackedRepoTask.java:66) at com.bigbrassband.jira.git.services.async.AsyncProcessorImpl$1.doRun(AsyncProcessorImpl.java:86) at com.bigbrassband.jira.git.services.indexer.revisions.QueueEntry.run(QueueEntry.java:90) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.net.SocketTimeoutException: connect timed out 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:607) at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:284) at sun.net.NetworkClient.doConnect(NetworkClient.java:175) 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.<init>(HttpsClient.java:264) at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367) at