Summary

"An unexpected error has occurred" pop-up message appears on different Bamboo pages, such as the User Groups page and the Deployments tab.

Other symptoms:

• Unable to generate a Support Zip
• A "Background page refresh cannot contact server. Please ensure Bamboo server is available." error message pops-up
• Unable to dedicate agents with no error message in the User Interface. 
• The Instance health page is blank.

Environment

All supported versions of Bamboo with HTTPS configured in Tomcat.

Diagnosis

The following message pops up in Bamboo:

When checking the <bamboo-home>/logs/atlassian-bamboo.log, there are occurrences of the following XSRF check failure:

2021-06-03 10:54:56,075 WARN [http-nio-8085-exec-21] [XsrfResourceFilter] Additional XSRF checks failed for request: http://BAMBOO_URL/rest/troubleshooting/1.0/check/process/ , origin: https://BAMBOO_URL , referrer: https://BAMBOO_URL/plugins/servlet/troubleshooting/view/ , credentials in request: true , allowed via CORS: false

Cause

The most common cause for this is a misconfigured server.xml file inside the Bamboo installation folder, with missing proxy properties. You can find more information about the XSRF checks in the following documentation:

• Cross Site Request Forgery (CSRF) protection changes in Atlassian REST

Solution

Check the <bamboo-installation>/conf/server.xml and verify if the connector is properly configured, like in the example below. Usually, one of (or all) the following properties are missing: secure, scheme, proxyName, and proxyPort.

 <Connector
        port="8085"
        protocol="HTTP/1.1"

        maxThreads="150" minSpareThreads="25"
        connectionTimeout="20000"
        disableUploadTimeout="true"
        acceptCount="100"

        enableLookups="false"
        maxHttpHeaderSize="8192"

        useBodyEncodingForURI="true"
        URIEncoding="UTF-8"

        redirectPort="443"
        compressableMimeType="text/html,text/xml,text/plain,text/css,application/json,application/javascript,application/x-javascript"


        secure="true"
        scheme="https" 
        proxyName="proxy-bamboo.com"
        proxyPort="443">
    <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
</Connector>