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I am having an issue using the GetAuthorizationGroups method of the UserPrincipal class in a web application. Using the following code, I am receiving "While trying to retrieve the authorization groups, an error (5) occurred" PrincipalContext context = new PrincipalContext(ContextType.Domain, null, "DC=MyCompany,DC=COM", "username", "password"); UserPrincipal p = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, "joe.blogs"); var groups = p.GetAuthorizationGroups(); I believe this code works to an extent. When I view the context object, I can see the server and username/password have been resolved correctly in the object When I view the p object, I can see AD details have been populated like phone no etc. Here is the stack trace from the error. [PrincipalOperationException: While trying to retrieve the authorization groups, an error (5) occurred.] System.DirectoryServices.AccountManagement.AuthZSet..ctor(Byte[] userSid, NetCred credentials, ContextOptions contextOptions, String flatUserAuthority, StoreCtx userStoreCtx, Object userCtxBase) +317279 System.DirectoryServices.AccountManagement.ADStoreCtx.GetGroupsMemberOfAZ(Principal p) +441 System.DirectoryServices.AccountManagement.UserPrincipal.GetAuthorizationGroupsHelper() +78 System.DirectoryServices.AccountManagement.UserPrincipal.GetAuthorizationGroups() +11 By removing the username and password details from the PrincipalContext constructor and changing the applicationpool (in iis7) to run as the same user (username@mycompany.com) - the following code works. PrincipalContext context = new PrincipalContext(ContextType.Domain, null, "DC=MyCompany,DC=COM"); UserPrincipal p = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, "joe.blogs"); var groups = p.GetAuthorizationGroups(); I need to get the code in the first example t

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