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KEPServerEX OPC UA Client Driver Unable to Connect to CIMON OPC UA Server

uvcssb
4-Participant
4-Participant
‎Nov 28, 2024 04:31 AM
‎Nov 28, 2024 04:31 AM

KEPServerEX OPC UA Client Driver Unable to Connect to CIMON OPC UA Server

1. Current Situation

CIMON OPC UA Server Information:

  • IP: [CIMON OPC UA Server IP]
  • Port: [CIMON OPC UA Server Port]
  • Network: Same local network (Ping test and TCP connection successfully confirmed).

KEPServerEX Status:

  • The OPC UA Client Driver in KEPServerEX cannot detect the CIMON OPC UA Server during server discovery.
  • Even when the Endpoint URL is manually entered, the connection fails.

Other Client Status:

  • UaExpert:
    • Successfully connects to opc.tcp://[CIMON OPC UA Server IP]:[CIMON OPC UA Server Port] (with Security Policy: None, Message Security Mode: None).
    • Node browsing and data reading from the CIMON OPC UA server work perfectly.
  • Node.js (node-opcua library):
    • Successfully connects to the same Endpoint URL and reads data successfully (with Security Policy: None, Message Security Mode: None).

2. Troubleshooting Attempts

Network Connection Check:

  • From the machine running KEPServerEX ([KEPServerEX Machine IP]):
    • Ping to [CIMON OPC UA Server IP] → Successful response.
    • Test-NetConnection [CIMON OPC UA Server IP] -Port [CIMON OPC UA Server Port] → TCP response successful.
  • No network connection issues detected between KEPServerEX and CIMON OPC UA Server.

Firewall Configuration:

  • Allowed TCP Port [CIMON OPC UA Server Port] on the machine running KEPServerEX ([KEPServerEX Machine IP]).
  • Configured both inbound and outbound rules.

Security and Authentication:

  • Configured KEPServerEX with Security Policy: None and Message Security Mode: None to match the CIMON OPC UA Server.

3. Main Issue

The issue does not appear to be related to network connectivity or security/authentication configurations.

While other clients (UaExpert, Node.js-based clients) successfully connect to the CIMON OPC UA Server, only KEPServerEX fails to discover or connect to the server.

4. Environment Details

  • KEPServerEX Version: v6.17.240.0
  • Machine Running KEPServerEX:
    • IP: [KEPServerEX Machine IP]
  • CIMON OPC UA Server:
    • IP: [CIMON OPC UA Server IP]
    • Port: [CIMON OPC UA Server Port]
    • Security Settings: Security Policy None, Message Security Mode None
  • Network Environment: Same local network, TCP Port [CIMON OPC UA Server Port] allowed through the firewall.
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rajskumar
14-Alexandrite
14-Alexandrite
(To:uvcssb)
‎Nov 28, 2024 06:58 AM
‎Nov 28, 2024 06:58 AM

Hello, Thank you for the detailed description.

 

Are you encountering any errors while browsing the CIMON OPC UA Server (in manual connection)? Please verify the client-side configuration using the article below.

 

https://www.ptc.com/en/support/article/CS298913

If you are prompted to log in to view the complete article, you can use your MyKepware login credentials.

 

Additionally, I suggest capturing Wireshark packets to identify the issue.

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uvcssb
4-Participant
4-Participant
(To:rajskumar)
‎Nov 28, 2024 10:07 PM
‎Nov 28, 2024 10:07 PM

Current Situation

  1. CIMON OPC UA Server Details

    • IP: [CIMON_IP]
    • Port: 4840
    • Security Policy: None
    • Message Security Mode: None

  2. UaExpert Connection

    • Successfully connects to the CIMON OPC UA Server, allowing node browsing and data reading.

  3. Node.js Connection

    • Successfully connects to the CIMON OPC UA Server, enabling data read/write operations.

  4. KEPServerEX Connection

    • Using the OPC UA Client Driver, attempting to connect to the CIMON OPC UA Server results in a BadTcpMessageTooLarge error.
    • Wireshark packet analysis shows that after sending a GetEndpointsRequest, the CIMON OPC UA Server returns this error.

Wireshark Request Packet Comparison

  1. UaExpert Request Packet:

    • Message Size: 98 bytes
    • Details:
      • EndpointUrl: opc.tcp://[CIMON_IP]:4840
      • LocaleIds: None (ArraySize: 0)
      • ProfileUris: None (ArraySize: 0)

  2. KEPServerEX Request Packet:

  3. TCP Segments Comparison:

    • UaExpert Request: Sent in a single TCP segment.
    • KEPServerEX Request:
      • Reassembled TCP Segments:
        • Frame #101: 12 bytes
        • Frame #102: 4 bytes
        • Frame #103: 151 bytes
      • Total Length: 167 bytes
    • It seems the CIMON OPC UA Server might have trouble handling segmented TCP packets from KEPServerEX.

  4. Comparison Results:

    • KEPServerEX’s request is slightly larger due to the inclusion of ProfileUris.
    • However, 167 bytes is not typically considered a "large message" in OPC UA communications.
    • UaExpert successfully handles requests larger than 167 bytes without issues.

Steps Taken to Resolve

  1. Network Connection

    • Ping and TCP connection tests confirm accessibility (Port 4840).

  2. KEPServerEX Configuration

    • Configured with Security Policy: None, Message Security Mode: None.

  3. Wireshark Analysis

    • Compared request message size and TCP segments between UaExpert and KEPServerEX.
    • KEPServerEX’s request is sent in multiple TCP segments, which might not be properly handled by the CIMON OPC UA Server.
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uvcssb
4-Participant
4-Participant
(To:rajskumar)
‎Nov 28, 2024 10:32 PM
‎Nov 28, 2024 10:32 PM

 

Current Situation

CIMON OPC UA Server Details

  • IP: [CIMON_IP]
  • Port: 4840
  • Security Policy: None
  • Message Security Mode: None

UaExpert Connection

  • Successfully connects to the CIMON OPC UA Server, allowing node browsing and data reading.

Node.js Connection

  • Successfully connects to the CIMON OPC UA Server, enabling data read/write operations.

KEPServerEX Connection

  • Using the OPC UA Client Driver, attempting to connect to the CIMON OPC UA Server results in a BadTcpMessageTooLarge error.
  • Wireshark packet analysis shows that after sending a GetEndpointsRequest, the CIMON OPC UA Server returns this error.

Wireshark Request Packet Comparison

UaExpert Request Packet:

  • Message Size: 98 bytes
  • Details:
    • EndpointUrl: opc.tcp://[CIMON_IP]:4840
    • LocaleIds: None (ArraySize: 0)
    • ProfileUris: None (ArraySize: 0)

KEPServerEX Request Packet:

TCP Segments Comparison:

  • UaExpert Request: Sent in a single TCP segment.
  • KEPServerEX Request:
    • Reassembled TCP Segments:
      • Frame #101: 12 bytes
      • Frame #102: 4 bytes
      • Frame #103: 151 bytes
    • Total Length: 167 bytes
  • It seems the CIMON OPC UA Server might have trouble handling segmented TCP packets from KEPServerEX.

Comparison Results

  • KEPServerEX’s request is slightly larger due to the inclusion of ProfileUris.
  • However, 167 bytes is not typically considered a "large message" in OPC UA communications.
  • UaExpert successfully handles requests larger than 167 bytes without issues.

Steps Taken to Resolve

Network Connection

  • Ping and TCP connection tests confirm accessibility (Port 4840).

KEPServerEX Configuration

  • Configured with Security Policy: None, Message Security Mode: None.

Wireshark Analysis

  • Compared request message size and TCP segments between UaExpert and KEPServerEX.
  • KEPServerEX’s request is sent in multiple TCP segments, which might not be properly handled by the CIMON OPC UA Server.

 

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