Blue Ocean page unable to completely download its page

[BTH]

Hi guys,

This is fresh Jenkins server, recently created with no job. I've been setting up plugins.

Everytime I'm trying to open the Blue Ocean page, it ends up with hanging.

The way I'm enter to the Blue Ocean page is this Blue Ocean button

Jenkins version 2.263.3, Java Open JDK 8

Related log from /var/log/jenkins/jenkins.log

2021-02-05 07:25:42.730+0000 [id=14]	WARNING	o.e.j.s.h.ContextHandler$Context#log: Error while serving http://x.x.x.x8080/adjuncts/0ac646c3/org/jenkins/ui/jsmodules/blueocean-pipeline-editor/jenkins-js-extension.js
java.util.concurrent.TimeoutException: Idle timeout expired: 5000/5000 ms

Seems like this is not a popular issue. I can't find any related topic, solution. has anyone run into the same problem?

Appreciate your help

Cheers

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