When you try to access BizTalk360 from a remote location, example BizTalk360 is deployed in SERVER1 and you try to access it from SERVER2 using the url http://SERVER1/BizTalk360, you may be constantly challenged by the user name/password. The issue is mainly to do with the Kerberos authentication issue.
- If you are using IIS 6.0, the work around mentioned in the KB article http://support.microsoft.com/kb/871179 will fix the issue.
- If you are using IIS 7.0, one of the solution to the problem is by changing the order of authentication providers in IIS. In IIS Manager (inetmgr), click on BizTalk360. On the features page, double click on "Windows Authentication", right click and select "Providers". Make sure the order is as shown in the below screenshot.