2.1 Gnatsweb and GNATS do not like each other.

Q: I have installed GNATS 3.999.x and Gnatsweb 2.9.x, and I cannot get them work together.

Symptoms are that "make test" fails; if Gnatsweb is installed nevertheless, it hangs when trying to login into the GNATS server.

A: The versions are incompatible. Gnatsweb 2.9.x is for use with GNATS 3.113.1. With GNATS 3.999.x, you must use Gnatsweb 3.99.x; it is in the contrib subdirectory of the GNATS distribution. (GNATS 3.999.x/Gnatsweb 3.99.x were pre-releases of the 4.0 releases. As 4.0 is out now, you may consider to upgrade to the non-pre versions.)

For GNATS 4.x, use Gnatsweb 4.0 or greater.