IIS Feature Feedback
Changing FastCGI settings completely resets ALL other applications ho...
Re: Changing FastCGI settings completely resets ALL other application...
Nov 26, 2019 01:40 PM|lextm|LINK
If this is an expected behaviour it should be documented, as it prevents stable shared hosting of applications in IIS when FastCGI is used.
On a single IIS server, any interrupt is expected when you change an IIS setting. I believe that's why Microsoft didn't even consider documenting such.
If you do want "stable shared hosting", then the web sites/apps should be put into load balancing clusters, and each servers should be configured separately.