Access to the remote server is denied because no login-mapping exists, ASP.NET

I know my stored procedure works with the linked server, when i run it from a web project i get this error, apparently i do not have the correct user named in mapping to run against the linked server.
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dbaSQLConnect With a Mentor Commented:
if you configure the link from serverA to serverB, the login used in serverA linkes server needs to be the login from serverB

see this:
what is the whole statement you used with sp_addlinkedserver?
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