NFS.listdir waits indefinitely

[jmicho]

[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import libnfs as nfs
>>> x = nfs.NFS('nfs://192.168.10.165/volume1/data/')
>>> x.listdir('.')

The share is at the same time mounted via os and it works fine.

OS: Ubuntu 20.04 libnfs (os): 4.0.0-1 libnfs (python): 1.0.post4