The site on iis is unavailable. How to fix?

Question

IIS

There is a site on iis 10. It works before authorization, after entering the login password, the error is ERR_HTTP2_PROTOCOL_ERROR. The last entry in the logs

spoiler

2019-10-23 06:35:50 192.168.10.86 POST /Identity/Account/Login - 443 - 192.168.15.155 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/77.0.3865.120+Safari/537.36 https://сайт/Identity/Account/Login 302 0 0 93

In iis, authorization is anonymous.