SIOCADDRT: No such process

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This article/section is a stub — probably a pile of half-sorted notes and assertions some of which may well be wrong, and not verified as a whole. Feel free to add or refine.

...related to networking.

Seems to be reported in cases where adding a default route (route add default gw someip) fails.

The reason for this is usually that the default route you specified did not belong to a known network. (I'm guessing route tries to complete the entry to be added by trying to find the device it should route to, by looking up the net the IP belongs to, but finding none.)

If that sounds plausible for your network config, the solution is correcting your network config.