When hitting the site using our external domain name, www.domain.com/jira, I am unable to upload attachments to a ticket. When hitting the site via servername.subdomain.domain.com/jira; I am able to upload any attachment just fine. Our standardized way of hitting the site is via www.domain.com/jira.
I'm not sure when this issue started. I cannot find anything in any log pointing to a potential problem with any configuration.
In our environment all requests get routed through apache, using mod_proxy AJP.
This issue occurs with various file types and sizes.