Thank you.
Sorry, I was on vacation outside the city.
But unfortunately it didn’t work.
For testing:
- Created a Hyper-V virtual machine based on Windows Server 2022, turned off the firewall
- Deployed a clean OpenHab
- Added a user to Windows (user) and OpenHab (admin)
- Configured DNS (local network)
- Installed IIS (select all components + URLRewrite and requestrouter)
- Created a site (not SSL), Enable Basic Auth
- Enable ARP Proxy, made a reverse proxy for OpenHab (the config is specified)
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="Reverse Proxy" stopProcessing="true">
<match url="(.*)" />
<action type="Rewrite" url="http://localhost:8080/{R:1}" appendQueryString="true" />
<serverVariables>
<set name="HTTP_X_FORWARDED_HOST" value="{HTTP_HOST}" />
<set name="HTTP_X_FORWARDED_PROTO" value="http" />
<set name="Authorization" value="""" />
</serverVariables>
</rule>
</rules>
</rewrite>
<httpProtocol>
<customHeaders>
<remove name="X-Powered-By" />
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Credentials" value="true" />
<add name="Access-Control-Allow-Headers" value="Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range" />
<add name="Access-Control-Allow-Methods" value="GET,POST,OPTIONS,PUT,DELETE,PATCH" />
<add name="Set-Cookie: X-OPENHAB-AUTH-HEADER" value="1" />
<add name="Access-Control-Allow_Credentials" value="true" />
</customHeaders>
</httpProtocol>
</system.webServer>
</configuration>
It allows me to enter the site through basic authentication…
But I still can’t log in to OpenHab (through the shield). The hub allows me to enter a name and password…
…and in response to login, it shows its main interface and the user is not authorized 
I’ve looked in wireshark and openhab logs and found nothing suspicious…