Mount goes OK, but first access results in "Software caused connection abort" error

[DurvalMenezes]

Hello,

# fuse-nfs -n 'nfs://REDACTED/REDACTED/REDACTED/?if=venet0&version=4' -m /mnt2
   -> Shows no messages, exit status ($?) is 0 

# ls /mnt2
   ls: reading directory /mnt2: Software caused connection abort

# ls /mnt2
   ls: cannot open directory /mnt2: Transport endpoint is not connected

I'm running in an old platform (RHEL6 with kernel 2.6.32, and I can't upgrade, please don't ask why) but all other FUSE filesystems (ENCFS, etc) works OK.

There's no other output, including syslog and dmesg. I can see no "--verbose" or equivalent options for this module.

How can I debug this?

Thanks in advance.