Component is not allowed to connect with subdomain?

I have two external components. Component #1 runs, connects and shows up in the Sessions->Component Sessions list. It registers as “pittpatt.jnicholsonpc”. Component #2 is virtually identical, with logic differences, and is attempting to connct as “bio.jnicholsonpc”. It fails with the error: Component is not allowed to connect with subdomain: bio". I can change “bio.jnicholsonpc” to “pittpat.jnicholsonpc” and component #2 now registers successfully. Please help! What is causing this?