Classic app function not working from remote computer while working in localhost

Hi, we've experiencing a weird issue with our classic web application after migrating to a new server (from 2003 to 2012 R2). It working well for almost all functions except product detail page, when opened from the server itself (using localhost or it IP address) it working fine but when opened from other computers in the network it returning an error:

Permission for files (anonymous user) have been added in application folder too. Already try it on WIndows Server 2008 R2 as well and experiencing the same issue.

Please advice how to resolve the issue, any advice is highly appreciated.

Thanks in advance.

Regards,

Acung