While adding sub-domain, I'm facing issue with POST request. I tried adding sub-domain and the server is not accepting the POST request.
Solution -
1. Login to Plesk and Go to
Tools & Settings > Web Application Firewall > Settings.
2. Select ModSecurity mode to 'Fast'.
3. Open 'modsecurity.conf' file:
C:\Program Files\ModSecurity IIS
4. Set the below option
SecRequestBodyAccess Off
5. Restart IIS.