: If you are trying to connect via OPC UA after installation and see certificate errors, you may need to use the OPC UA Configuration Manager to manually trust the server's self-signed certificate.
Right-click the certificate file and select .
The most straightforward fix is to connect the machine to the internet and run Windows Update . This allows the OS to automatically update its Trusted Root Certification Authorities store. : If you are trying to connect via
Obtain the necessary root certificate files ( .cer or .crt ) from a machine with internet access or directly from the PTC Support Portal .
If manual installation of GlobalSign or Microsoft root certificates does not work, it is recommended to open a support ticket with the Kepware team for specific offline certificate packages. This allows the OS to automatically update its
If the server must remain offline or cannot be updated, you must manually install the required root certificates (often from issuers like GlobalSign or VeriSign):
: Users on older operating systems like Windows 7 or Windows XP SP3 frequently encounter this because these versions no longer receive automatic certificate updates. If the server must remain offline or cannot
To resolve this issue, you must ensure the system can trust the certificates used by the Kepware installer.