Verify FlexNet Manager Suite On Premises Application Server Authentication Settings in IIS

If you are having authentication issues when attempting to connect to FlexNet Manager Suite, perform the following steps on the FlexNet Manager Suite application server machine to verify the application server authentication settings in IIS.

To configure FlexNet Manager Suite authentication in IIS:

1. Open Internet Information Services (IIS) Manager.
2. Select ManageSoftServices in the tree. The Features view opens.

3. Double-click Authentication. The Authentication view opens.

4. Make sure that the following three options are set to Enabled:
ASP.NET Impersonation 
Basic Authentication 
Windows Authentication  

All other authentication methods should be set to Disabled.