There are a couple of possibilities here, based on what I can see.
First of all, what are the names of the domain you're connecting from and to? Is "domain.local" the target domain? If domain.local is the source domain, and the target is something different, do these two domains trust each other? If the target domain does not trust domain.local, then you can't authenticate to any resources in the target domain using a domain.local account.
Also, I don't remember off the top of my head if "domain.local\Administrator" will work. Typically that syntax is used with a NetBIOS domain name, eg DOMAIN\Administrator, and when you want to use the DNS name of a domain, you would use Administrator@domain.local syntax instead. It may be acceptable as-is, but I can't test it right this second.