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ADFS Resiliency NLB question


I have an ADFS and ADFS Proxy servers already configured an working as part of an Office 365 setup. I now need to introduce resiliency in the form of an additional ADFS server and an additional ADFS proxy server. Windows NLB is our preferred  method. According to this thread, NLB has to be installed before teh ADFS farm:


Is this definitely correct? I.e. is there any other way of adding NLB resiliency without having to re-build the existing ADFS  and ADS proxy servers?


2 Solutions
Matt VCommented:
Having just built that exact setup, I believe the article is correct.  Because you bind the ADFS service you would need the NLB interface available when you do the ADFS setup.
May be as per article NLB should be setup 1st, but I don't think so

Then what about scenarios where only 1 server is available for initial setup and later you would add another server in farm?

According to my understanding NLB has no direct connection to ADFS, what I mean NLB virtual URL can be used as ADFS URL
There is restrictions on ADFS setup that once you setup ADFS, you cannot change Federation service URL name, if you try to do so, it will break ADFS functionality
If your federation service name is same as server FQDN, then you cannot install NLB because NLB need separate virtual name associated with VIP

I hope in your case ADFS url is different than actual server FQDN and its currently pointing to server actual IP
If above is true, you can go ahead and setup NLB, NLB will require new internal IP as VIP and you should provide ADFS service URL to this VIP in DNS, so this will allow ADFS requests to listen on that specific IP
Ultimately what you are doing is just making some IP changes in DNS and ADFS service URL remains unchanged
The same is true in case of ADFS proxy server

One last thing, you need to change adfs proxy public IP binding to point it to VIP of NLB
AmitIT ArchitectCommented:
No need to build the ADFS servers.
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