how to create a customer portal link in an intranet network?

[projecttest2255]

Dear Team,

 we have licensed JIRA service desk but we installed a trial  version and trying to setup on a local Intranet network.I have created a new test project and created 2 user. however i m trying to access the the customer portal using like the below URL its getting error "Site Cannot be reached".

 http://<computer_name_or_IP_address>:<HTTP_port_number>/jira/servicedesk/customer/portals 

I used the same configuration,connected to internet  and using the  same URL  its working fine .I can able to access the customer portal and can be create request and all.Please help to resolve the issue

[Nic Brough -Adaptavist-]

This is a problem with your internal network - it's either blocking the route, or not routing from your machine to the server.