AjaxError - connection failed when trying to connect to jenkins

[oshai]

I am trying to configure new Jenkins dashbaord but get an error: AjaxError - connection failed when trying to connect to jenkins. I think this is related to the issue here: https://github.com/AdamNowotny/BuildReactor/issues/43

Might be related to firewall or other settings. Any idea how to overcome that?

[AdamNowotny]

Would need more information from the background page console and network tab. If it's authentication related then logging in in the browser first might help.

[oshai]

Below is what I see in console, doesn't looks like auth problem. maybe the /jenkins in the url? or maybe I have to setup an ssh tunnel? ping to the server works.

[xfyuan]

I have the same problem which reporting AjaxError.

2019-12-18T02:45:23.802Z core.messages 
Object
name: "availableProjects"
response:
error:
message: "cannot GET http://xxx.xxxxxx.cn:8080/api/json?tree=jobs[_class,name,url,buildable,fullName,jobs[_class,name,url,buildable,fullName,jobs[_class,name,url,buildable,fullName]]] (400)"
name: "AjaxError"
__proto__: Object
__proto__: Object
serviceSettings: {baseUrl: "jenkins", name: "xxx_jenkins", projects: Array(0), url: "http://jenkins.xxxxxx.cn:8080", username: "xxxxxxx", …}