mount_smbfs: unable to open connection: syserr = Operation timed out

[Gerald Host]

I used some non-default kernel options to have more RAM (PAE).

On one BSD machine this command works and mounts as expected.  On another
one it fails:

bsd# mount_smbfs -I 192.168.1.10 //administrator at mpa-fnp/restorereports
/mnt/reports
mount_smbfs: unable to open connection: syserr = Operation timed out


The difference between the machines is the kernel options and one failing is
behind a router, but I don't think any ports are blocked.  Both are 6.1servers:

FreeBSD 6.1-RELEASE (PAE) <--- problem server behind router
FreeBSD 6.1-RELEASE (GENERIC) <--- works

Any ideas?