Need to catch invalid/missing user input for the enum4linux format

I was having some issues connecting an authenticated session with Windows Server 2008 x64, commenting out #dce.set_auth_level(ntlm.NTLM_AUTH_PKT_INTEGRITY) fixed that issue.

Also when trying to connect to a NULL Session it was failing also. Changing the hsamrconnect to hsamrconnect2

resp = samr.hSamrConnect2(dce) fixed this also.

Hello
Python 2.x will no longer be supported by their upstream developers in 2020. Thus Debian developers are actively removing Python 2 support in Debian Testing with the goal of getting rid of Python 2 in Debian 11 (bullseye).
Impacket is now Python 3 compatible. You should consider to switch polenum to Python 3.

Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=937307

The variable assignments on lines 51 and 52 should be moved to the outside if statement.
The correct piece of code should be like this:

if not lockout:
        if (low != 0):
            high = abs(high+1)
        else:
            high = abs(high)
            low = abs(low)

        tmp = low + (high)*16**8  # convert to 64bit int
        tmp *= (1e-7)  # convert to seconds
    else:
tmp = abs(high) * (1e-7)

Otherwise the tmp variable would not be initialized and the rest of the code would not correctly interpret the data.

# polenum
Traceback (most recent call last):
  File "/usr/bin/polenum", line 33, in <module>
    from impacket.dcerpc import dcerpc_v4, dcerpc, transport, samr
ImportError: cannot import name dcerpc_v4

impacket 0.9.15

Hey, didn't realise you'd forked our polenum code. Great to see it maintained (thanks!) but maybe you could drop a reference in to https://labs.portcullis.co.uk/tools/polenum/ which is where we made the original release (alongside the patches we submitted to the CORE folks to add the necessary library changes). I think we could probably put a link up in the opposite direction so that folks can find your latest updates too.