Hi, it seems like you didn’t add HMWP rules correctly in nginx config file. Please generate debug report from HMWP start tab and post it here as private reply. Also, post here your site’s nginx config content (after you have added HMWP rules in it). Thanks!
– disable/uncheck “Anti Spam” option in HMWP General settings tab
– disable/uncheck “Directory List” option in General settings tab
– disable/uncheck “Hide PHP Files” option in General settings tab
– if still the issue then empty out “Ajax URL” field in Permalinks & URLs tab
– if still the issue then try disabling IDS option in IDS Firewall tab