Issue creating export whit SFTP

        Traceback (most recent call last):

File “/opt/rockstor/eggs/gunicorn-0.16.1-py2.7.egg/gunicorn/workers/sync.py”, line 34, in run
client, addr = self.socket.accept()
File “/usr/lib64/python2.7/socket.py”, line 202, in accept
sock, addr = self._sock.accept()
error: [Errno 11] Resource temporarily unavailable

@Alfredo_Blanco Welcome to the Rockstor community forum.
Pretty sure what you are running into here is a limitation in how Rockstor impliments the sftp arrangement. Please see the following section in our docs:

Secure File Transport Protocol (SFTP)

Where these limitations are outlined ie:

By default no user other than root are allowed to login via ssh or use SFTP. This restriction improves security but means there are certain conditions that must be met to gain sftp access to a Rockstor share.

and

the SFTP user must be a Rockstor user
the SFTP user must also be the owner of an exported SFTP share

Hope that helps.