In trying to test a platform migration, we went through all the steps to move data from our old server to our new server then dropped a modified
hosts file on a test client to make it think that every component server in our old BigFix was our new server. This worked fine except when it came to seeking our failback server. Even though
x-bes-fallback-server is defined by hostname and that hostname is redirected in the
hosts file (along with the root server and all relay servers), the relay selection process found the “real” address for the fallback server and connected to it instead.
I was able to bypass this by blocking that IP address in the test client’s firewall (HA! SO THERE!), but it’s odd that every other address redirected to the new server except the fallback.