So, ¿the valueError exception is ok?

Hum... That's true...
I've tried with https and it worked
but...
When I load ajenti-panel, I think the daemon doesn't start succesfully, because the ajenti server works while the console command is running. It never ends (waits for input). The traceback error it shows is the following:

Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/gevent/greenlet.py", line 390, in run
result = self._run(*self.args, **self.kwargs)
File "/usr/lib/pymodules/python2.7/ajenti/feedback.py", line 52, in worker
resp = send('register', data)
File "/usr/lib/pymodules/python2.7/ajenti/feedback.py", line 36, in send
return json.loads(response.content)
File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 365, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 383, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
<Greenlet at 0x1b39c30: worker> failed with ValueError

PD: I've found how get the ajenti daemon: ajenti-panel -d. But, anyway, this could be a bug which must be solved?

Even with this error, the ajenti server keeps on because it shows an exit when I try to connect through my web browser and the console shows this output:

http://pastebin.com/TGPqJgeH

Well, I haven't get any success with netcat, neither on my local machine or the remote one I have got it working.
I've reinstalled all and I get this exit with ajenti-panel:
http://pastebin.com/tycd6WHH

Well, I try to contact with host company. By the way, It is possible to change the port of ajenty via commands?

I've uninstalled apache and restarted the server. It didn't work. 
The page (firefox) shows the following error: The connection to the server was reset while the page was loading.

well, I've seen it use ngnix, but it has apache installed. Could it be a problem?