PowerLogic SCADA Web Client Returns #COM and 'No Protection Key is Found' When the Loopback IP is Used in Network Addresses
Issue
PowerLogic SCADA (PLS) Web Client returns #COM for all values and displays the popup message: “No Protection Key is Found.” Runtime on the server machine functions normally (no #COM).
Product Line
Power SCADA Operations 8.2
Power Operation 2020 and 9.0
Power Operation 2021
Power Operation 2022
Power Operation 2023
Power Operation 2024
Environment
PowerLogic SCADA (PLS) – Web Client
Cause
The Loopback IP Address (127.0.0.1) is used in Network Addresses within the primary project and/or any Included Projects.
When loopback is used, remote clients look to themselves for data and for licensing, resulting in #COM values and the “No Protection Key is Found” popup.
Resolution
- In Citect Explorer, highlight the project.
- Open Citect Project Editor → Servers → Network Addresses.
- Replace any 127.0.0.1 entries with the actual IP address assigned to the network interface used to connect to system devices.
- Repeat steps 2–3 for all Included Projects (Project Editor → System → Included Projects).
- Compile and run the project. Then relaunch the Web Client.
Note
While the Loopback Address is convenient for testing, it is highly recommended to use the actual assigned IP addresses for Network Addresses in live conditions so remote clients can resolve the correct server for data and licensing.
Recommendation:
If you are using an older version of
Power Operation, consider upgrading to the latest version for improved protocol support and security. For assistance with integration or upgrades, contact Schneider Electric Technical Support at: pmo-psup@se.com
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