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Environment/Versions TTworkbench 32/64 Bit, Microsoft Windows/Linux TTsuite-Wave-DSRC Answer If the existing certificates are expired do the following: 1. Request new valid certificates from your certificate provider. 2. Open TTworkbench with the workspace where you have the project TTsuite-WAVE-DSRC_X.Y.Z 3. The new certificates can replace the ones in the project TTsuite-WAVE-DSRC_X.Y.Z\ttcn3lib\TTlib-Security\tt3plugins\SecurityExternalFunctions\configurations) or can be configured in the project in changing the environment variables (menu Project > Properties > TTCN-3 > Execution - TTman > Environment)