We're currently looking at migrating our server setup to another provider. Across a dozen servers we host anywhere from 1500-2000 websites. For around 300-400 of those domain names we don't have the ability to change the DNS records to point at the IP address of our new server. The rest are pointing at our own nameservers so we can switch them to the new IP addresses with.
My issue is how to deal with the large amount of domain names that we don't have access to. All of our servers are WIN2012. So far I've looked at creating reverse proxies which get's me as far as IIS on the second machine, but doesn't seem to want to match up the host name (for example, accessing www.bobswebsite.com gets me to 83.196.255.25 and the return proxy then moves in on to the next server 76.345.33.343, but returns the default IIS website rather than the website within IIS which has the correct host).* fake IP addresses.
Does anyone have any potential advice or a direction that's worth pursuing?
P.S We'll be retaining a small server without old hosting company so will be able to forward requests for an additional year, to give us time to get in touch with existing customers and get their records changed.
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