[jitsi-users] Calling and desktop sharing difficulties - I believe I might have some firewall problem on my side... Possible?


#1

Hi,

  I'm using Jitsi mainly to do desktop sharing, and I seem to have a

problem on my side - I think… I’m just not capable of
identifying it clearly so far.

  The situation is this: I'm using Jitsi 1.0 from an OpenSUSE Linux

11.4 computer, the other party is using 1.0 also but from a
Windows computer (I don’t know what version, I forgot to ask). We
both have accounts at Ippi, and we’re both using a version of
Jitsi downloaded a few days ago.

  What happens is this:

  * I can't call him, but he can call me.

  * At first he can't seem to show me his desktop.

  * I try to show him mine, he doesn't receive it, I stop, he shares

his, this time I receive it.

  * I can't send him a text message either. He never receives it.

  So far I've been able to work around the problem like that (if I

can see his desktop then I can guide him), but this isn’t very
practical.

  My local network is set up like this:

  External router (with firewall) => Local Slackware 13.1 server

with 2 network card (external / internal) and its own firewall
=> Internal router (without firewall) => Workstations (with
their own firewalls).

  I'm wondering if some ports need to be forwarded from the external

router to the server and from there to the workstations (or at
least one of them) - I know how to do it, assuming this is the
problem, I’ve done it for VLC to access the ADSL TV from my ISP…
I just don’t know which ports are concerned!

  Or if I'm completely wrong with this and this isn't a firewall

problem, does anyone has an idea as to what’s going on?

  Thanks.

  Seb.

  PS: When I try between my main workstation, and my laptop

connected to a VPN (so it’s technically outside my local network)
everything works perfectly fine both ways… The laptop’s using
OpenSUSE 12.1 and also Jitsi 1.0.


#2

Hi again,

After further testing, I am not so sure the problem's on my side

anymore…

For the record, roughly the problem is: I can't call the other party

(“busy”) but they can call me just fine. I can’t share my desktop
with them (well I could at times when using Jitsi 1.1 but it was
really unstable, I’ve downgraded back to the stable 1.0 since then),
but they can share theirs. I can’t send them text messages (they are
not received). I can’t see their online status.

Could one of these two suspects be the source of the problem?

* The win7 firewall on the other end?

* The secure ZTRP communication?

I've managed to make a test today from a win xp in Virtual Box and

after making an exception for Jitsi in the XP’s firewall settings
everything seemed to work fine… Without the exception it won’t
even connect at all. The first thing I noticed actually is I could
see the online status of the user in the XP from the other end…

Last night I had the good idea to start Jitsi from a console, and

I’ve saved the whole output. I’m attaching it to this e-mail, maybe
one of you will be able to decipher it, I sure can’t!

Thanks.

Seb.

jitsi_log.txt (45.5 KB)

···


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#3

Ok I've got a confirmation here: it's a firewall issue on the other end!
Tonight the other party turned his firewall off (Norton) and everything went smoother, I could share my desktop, I saw his online status, the text messages were going through...
So the question that remains is: what ports need to be opened on his end so he doesn't have to keep his firewall off?


#4

netstat is your friend... This is probably the fastest way to find out what is negotiating...

      Lee

···

On 04/18/2012 07:52 PM, S�bastien Cismondo wrote:

Ok I've got a confirmation here: it's a firewall issue on the other end!
Tonight the other party turned his firewall off (Norton) and everything
went smoother, I could share my desktop, I saw his online status, the
text messages were going through...
So the question that remains is: what ports need to be opened on his end
so he doesn't have to keep his firewall off?


#5

I answered this on the other thread but am also pasting it here for
completeness:

By default, Jitsi would bind all RTP sockets on ports between 5000 and 6000.

Hope this helps,
Emil

···

On 19.04.12 04:08, Lee Sharp wrote:

On 04/18/2012 07:52 PM, Sébastien Cismondo wrote:

Ok I've got a confirmation here: it's a firewall issue on the other end!
Tonight the other party turned his firewall off (Norton) and everything
went smoother, I could share my desktop, I saw his online status, the
text messages were going through...
So the question that remains is: what ports need to be opened on his end
so he doesn't have to keep his firewall off?

netstat is your friend... This is probably the fastest way to find out
what is negotiating...

      Lee


#6

Thanks - I had also seen your other answer.

I still don't see what else it could be except for a firewall

problem as things got back on track when the other party shut down
their firewall. Maybe Norton is just being too zealous? I wouldn’t
know I’ve been using exclusively Linux distributions for over 10
years… I guess now we’ll just have to keep experimenting to
confirm.

···


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