403 permission errors may occur due to incorrect IIS or disk permission configuration.
Here are the solutions.
1. The hard disk is in NTFS format. Modify the site root directory folder properties, add IUSR_your machine name and IWAM_your machine name in the security options, or put the file under WWWROOT and choose to inherit the parent folder permissions.
2. Under the site permissions, you can also specify the permissions of each file or directory under the site. (If your site is anonymous, but the next file is designated for non-anonymous access, a password is also required)
3. In the website ROOT directory, right-click → Properties → Security → Add EveryOne user, and give at least read permission.
4. Set the Directory Security tab in the site properties, click the Edit button next to Anonymous Access and Authentication Control, and remove Integrated Windows Authentication.
5. Don’t ignore the link to the picture. Under non-anonymous access, it can also cause a verification dialog box to appear, and each picture appears once (if an absolute URL is used)
6. Whether the FrontPage server extension is installed when installing IIS , if installed, please uninstall it.