[SQU] auth problems

I am having problems trying to get the password box to popup in the
client's browser but no password box comes up. Here is my code
Please tell me if i am doing something wrong.

acl ebsco dstdomain .ebsco.com
acl colstate dstdomain .colstate.edu
acl BAD dst 0.0.0.0/0.0.0.0
 
http_access allow ebsco
http_access allow colstate
http_access deny BAD

http_access allow localhost
acl proxyUSER proxy_auth REQUIRED

 
http_access allow proxyUSER
http_access deny all

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