I have an internal site which has windows authentication enabled in IIS (NTLM) and is in version 7.2. All working fine.
I recently upgraded the site to DNN 9.1.1 version and suddenly i see login prompt coming up sometimes when site loads.. or during button clicks or on API calls. The login prompt doesnt accept my windows credentials in IE and doesnt go away. In Firefox i can ignore it and able to move ahead. If i roll back to 7.2 version it works fine. I am not sure what has changed in 9.1.1 that is causing the login prompt.
Most of the timea, i see user logged in when site loads and only api clicks or certin button clicks that prompt for login.
Any suggestions would be helpful.
Thanks in advance.