問題

After clicking to install an add-on via JIRA Administration > Add-ons > Find add-ons, an error message :

An unexpected error occurred. Refer to the logs for more information

in a red box , despite the add-on is actually installed successfully.

診断

環境

• The user is accessing JIRA with Apache integrated. 

Diagnostic Steps

• Upload add-on file manually will install the add-on without any errors
• Install an add-on with proxy bypassed will also install the add-on without any errors

The following appears in the Apache log

[<date>] [evasive20:error] [pid xxxxx] [client ip_address:xxxxx] client denied by server configuration: proxy: http://proxy.com, referer: http://proxy.com/something

原因

The access to the marketplace was denied by an Apache configuration. 

回避策

Add JIRA base URL in a list of whitelisted IP Addresses in the proxy configuration file

参照:  

• https://www.linode.com/docs/websites/apache-tips-and-tricks/modevasive-on-apache#whitelisting-ip-addresses
• http://parkroad.co.za/identifying-and-fixing-modevasive-client-denied-server-configuration-errors