vipw: could not lock the passwd file: : Operation not supported

[Valerio Daelli]

Hi all,
we have FreeBSD 5.4 jail which is mounted via NFS from a host machine.
The filesystem containing the jail is mounted from a remote machine.
Everything is fine, except when I try to add a user in the jail I get a:

vipw: could not lock the passwd file: : Operation not supported

I solved the problem in pwd_mkdb using the -i switch.
But I can't find any similar options in vipw.
Has anyone an idea about this?
Bye

Valerio Daelli