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Remote OPC server with WinCC explorer

9/19/2023 10:21 AM	Rate (0)
StamGuy Experienced Member Joined: 3/20/2017 Last visit: 5/20/2025 Posts: 144 Rating: (2)	I use WinCC explorer V7.4 I configured a remote OPC server (kepware). In the tag management it seems that there is a connection, but in the runtime screen I get and error of connection not established (see photo). What can be the problem? Attachment OPC error.png (305 Downloads)

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9/19/2023 9:50 PM	Rate (0)
ElonksuM_SN_BN Regular Expert Joined: 5/6/2022 Last visit: 9/9/2025 Posts: 589 Rating: (123)	Hi StamGuy, Below I am going to share a FAQ that may help you resolve these types of errors that indicate "Self diagnostics": "Why does the message "Self diagnostics" appear and how do you analyze this (WinCC V7, PCS 7 and WinCC Runtime Professional)?" I recommend that you review it since they explain the possible reason why they appear and how to analyze it. I hope it can be of help to you. Best regards!
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9/29/2023 8:56 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/12/2025 Posts: 16409 Rating: (1935)	Hello StamGuy Do you use OPC UA or OPC DA(DCOM based)? If you use OPC UA then check in the rejected folder of the OPA Channel if there is a certificate that is rejected, if yes then cut and copy it to the certs folder and restart the RT again Bye Murof
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