We had similar issue when using IIS as proxy in front of JIRA (and Confluence). The problem origin is from IIS Request Filtering module which deny access to some extensions and URL segments.
It's possible to remove this filter for a specific web application using the following commands at administrator command prompt:
appcmd set config "Web app name" /section:requestFiltering /-fileExtensions.[fileextension='.config']
appcmd set config
This document is from our internal KB :
I think what you'll want to do is edit the following file in your JIRA application:
And if you want these to be shown as plain text, more than likely you'll find the line that begins with:
Then build upon it. So mine by default looks like this:
text/plain asc txt patch log java
So yours may look like this:
text/plain asc txt patch log java config
Change this and restart JIRA, then hopefully you see them, rather than downloading them.
Hope this helps!
What does the atlassian-jira.log file say while you are trying to open the .config file from JIRA ticket. I have reproduced by saving a .config file and attached on JIRA 7.0.5 SQL Server.
Also let me know what version of JIRA you are running so I will try to replicate the issue.
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