Consider a scenario where TMG Admin reinstalled TMG Enterprise Edition after a hardware failure and decided to rejoin the array member to the EMS. However, when TMG Admin tried to rejoin it, the following error occurred:
"This post showed how TMG admins need to be aware that EMS configuration will try to enforce the settings, in this particular scenario for a logging path that didn't exist in the joining array member. It's a good practice to always have the core settings matching in between EMS and the array members. Additionally document your recovery process making sure that all the requirements are in place to not get surprises down the road," suggests Microsoft.