Article - CS370652
"Unable to load driver DLL: C:\Program Files (x86)\Kepware\KEPServerEX6\drivers\siemens_s7_plus_ethernet.dll" when trying to use Siemens S7 Plus Ethernet driver in PTC Kepware products
Modified: 04-Apr-2025
Applies To
- Kepware Server (formerly KEPServerEX) 6.11 to 6.17
- ThingWorx Kepware Server (legacy) 6.11 to 6.17
Description
- Event Log displays error: Unable to load driver DLL: C:\Program Files (x86)\Kepware\KEPServerEX6\drivers\siemens_s7_plus_ethernet.dll
- Unable to use Siemens S7 Plus Ethernet driver
- Siemens S7 Plus Ethernet driver fails to load
- Driver DLL file located in the specified directory cannot be accessed
- The details of the certificate of the file C:\Program Files (x86)\Kepware\KEPServerEX 6\AGLink40.DLL (Right click>Properties>Digital Signatures>Certificate details) show one of the following messages:
- This certificate has been deactivated
- The issuer of this certificate could not be found
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