Funny thing happend. When I regenerated the proto file with name

servicemodulesecure.proto

instead of

service_modulesecure.proto

I could reach it and the

protoc

binary was invoked. At first I thought that it cannot parse

_

from path but after I changed it back to

service_modulesecure.proto

it alswo worked. 😕 Edit: I think the permissions are all right because I was able to run the tests from

pact-go/examples/grpc

directory without problems.