mountd fails intermittently

[Michael Sperber]

I'm running 5.4-STABLE (about two weeks old), and have just set up an
NFS server for the first time.  Remote mounts sometimes work fine, and
sometimes fail.

The symptoms are that "showmount -e" sez 

showmount: can't do exports rpc

and that "rpcinfo -u <host> mountd" often works fine n times in a row,
and then stops working, like so:

...
Michael-Sperbers-Computer[105] rpcinfo -u matt mountd
program 100005 version 1 ready and waiting
rpcinfo: RPC: Program/version mismatch; low version = 1, high version = 3
program 100005 version 2 is not available
program 100005 version 3 ready and waiting
Michael-Sperbers-Computer[106] rpcinfo -u matt mountd
program 100005 version 1 ready and waiting
rpcinfo: RPC: Program/version mismatch; low version = 1, high version = 3
program 100005 version 2 is not available
program 100005 version 3 ready and waiting
Michael-Sperbers-Computer[107] rpcinfo -u matt mountd
program 100005 version 1 ready and waiting
rpcinfo: RPC: Program/version mismatch; low version = 1, high version = 3
program 100005 version 2 is not available
program 100005 version 3 ready and waiting
Michael-Sperbers-Computer[108] rpcinfo -u matt mountd
program 100005 version 1 ready and waiting
rpcinfo: RPC: Program/version mismatch; low version = 1, high version = 3
program 100005 version 2 is not available
program 100005 version 3 ready and waiting
Michael-Sperbers-Computer[109] rpcinfo -u matt mountd
rpcinfo: RPC: Timed out
program 100005 version 0 is not available

>From then on, it'll keep failing.

... and, of course, doing it from the machine I really want to be doing
it from reliably switches it to failure mode.

Any ideas on what I should do?

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla