This behavior occurs when the OPC Servers is not being accessed by a licensed user, or the software is unlicensed.Additoinally, NI OPC Quick Client will automatically close after 2 hours, regardless of if NI OPC Servers is activated or not.However, if the configuration is booting into Demo mode, it could give you limited functionality for this duration. See the steps below for troubleshooting this issue:
1. In the Windows Start Menu open Services.2. Find the NI OPC Service, right-click it, and select Properties.3. Select the Log On tab.4. Select the This account option and type in the credentials for the user who is assigned the license.
6. Click Apply, then OK.
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A valid service agreement may be required, and support options vary by country.