You have installed Incentive on your webserver and enabled Windows Authentication. When you go to
http://mysite the website accepts the identity of the logged in user on the computer/client.
When you go to the FQDN, e.g.
http://mysite.domain.com you get prompted for a username and password.
To work around this behavior, each user must add *.domain.com or the appropriate IP address range to the Local Intranet Sites dialog box:
- In Windows Control Panel, click Network and Internet, and then click Internet Options.
- Go to Security tab, click Local intranet, and then click Sites.
- Click Advanced, and then type:
*.domain.comor an IP address range (for example, 157.54.100-200.*) in the Add this Web site to the zone box, where
domain.comis your company and top-level domain names.
- Click Add, click OK, click OK, and then click OK again to close the Internet Options dialog box.
- Restart the computer.
Also see https://support.microsoft.com/en-us/kb/303650 for more details.