How can I disable multiple Logon Credential Prompts to Web dispatcher link?

I have an SAP web dispatcher installed on a windows server and the web link is working, however I get multiple prompts to enter the same credentials whenever I am trying to access the link from a browser - I'm guessing its a prompt for every server in the balancer. What do I need to do in order to just enter my credentials once? Like an SSO for the web dispatcher...

Thanks,

Esteban