Installing fossil on 9front is not really difficult. Fossil is just a userland server which probably can even be copied as a binary, as long as the cpu is the same.

Here are the hostowner factotum/ctl readout from the auth server:

key proto=p9sk1 user=bootes dom=fritz.box  !password?
key proto=dp9ik user=bootes dom=fritz.box  !password?

and from the plan9port fossil server (which doesn't know dp9ik):
key dom=fritz.box proto=p9sk1 user=bootes !password?

I installed the standard /lib/ndb/auth:

hostid=bootes
      uid=!sys uid=!adm uid=*

Though, Moody's advice to try disabling auth in the fossil server  using the fossilcons may be a far simpler solution.
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