Ajax asmx web service connection

I have an application which calls an asmx web service with an ajax application. They are in different domains.(nsf is in aaa.com.bb domain and asmx web service application is aaa.com).When calling web service I am having permission denied error.

Is it a security restriction to call a web service between different domains?

Subject: ajax asmx web service connection

Yes.

Subject: ajax asmx web service connection

Recently saw an article on http://www.codestore.net about using ajax across domains using a proxy technique. Take a look there, perhaps may help?