#1 RPC: Authentication error; why = Client credential too weak

[TheErk]

When compiling an RPC server
(tsp_stub_server from TSP [https://savannah.nongnu.org/projects/tsp])
on a Fedora 7 box I end-up having the following error

Cannot register service: RPC: Authentication error; why = Client credential too weak

I should start rpcbind using -i "Insecure" mode
in order to be able to start my rpc server.

(or I may run the server as root user, but I don't want that)

the fact is this behavior is not compatible with
older rpc portmapper.

You may consult sibling bug on
https://savannah.nongnu.org/bugs/index.php?20936

[Orion Poplawski]

Part of the problem seems to be that the documentation is inaccurate. Not only does the communication need to be over the loopback address, but the source port must be a "reserved" port, which is causing some confusion. I'm not sure if the documentation or the code is incorrect (i.e. what is the real desired behavior). But it is a big restriction not to allow non-root programs to register a service.