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The network interface controller (NIC) profile must either be Domain or Private, not Public.

Ensure each server NIC has a Domain or Private Network profile.

To check your NIC profile, open Control Panel\All Control Panel Items\Network and Sharing Center

Where to find your NIC Profile in Windows

Coordinate with the network administrator to ensure compliance with the corporate security policy.

Run PowerShell as administrator.

Enter: Get-NetConnectionProfile

Look for the line for: NetworkCategory.

Take note of the InterfaceIndex of the NIC that you need to change.

If the NIC Profile or Network Category is Public, change it to Private or Domain (if a domain member).

Set

Profile

To    Command

Private    

Set-NetConnectionProfile -InterfaceIndex <IndexNumber> -NetworkCategory "Private"

Example (using 3 as Interface Index):

Set-NetConnectionProfile -InterfaceIndex 3 -NetworkCategory "Private"

Domain    

Set-NetConnectionProfile -InterfaceIndex <IndexNumber> -NetworkCategory Domain

Example (using 3 as Interface Index):

Set-NetConnectionProfile -InterfaceIndex 3 -NetworkCategory "Domain"

If the computer is part of a domain, the profile should already be "Domain".

If needed, consult your network administrator.

Another way to check is to go to Control Panel and navigate to Network and Sharing Center.

Control Panel\All Control Panel Items\Network and Sharing Center

Network Profile    Effect

     There is no issue for Domain or Private Network.

    There is an issue for Public network.

ACC Site communications may be affected.

ACC Client shows ACS as connected.

ACS Web Client and ACC Mobile show:  Invalid Username or Password 401 error

Consult your network administrator.

Note: After a server reboot, the NIC profile may revert to a "Public" setting. To ensure the NIC profiles remain as "Private or Domain Authenticated," customers should consult with their IT team for proper configuration.