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Level 2

Hello Adobe Campaing Community
I have an issue to acces an external url in javascript code 
I get this error 

the script is trying to access is not part of the authorized addresses in urlPermission (serverconf.xml)

 I m on sandbox instance I have  tried to find the serverconf.xml to add the url that I want to use but I could'nt find any option to do it
Any suggestions ? 
Thanks