Re: Netmeeting works but nothing else does
From: Brian Sullivan MVP (brians_at_WORMTIREDmeetingbywire.com)
Date: 02/28/04
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Date: Sat, 28 Feb 2004 08:46:49 -0500
Darren wrote:
> Apologies in advance for "latching" on to you on this.
>
>>> looking at the wi-fi network connection settings, Net Firewall
>>> Service is ticked and I can't untick it as I don't have admin rights
>>> (work laptop)
>>
>> Can you configure it? Allowing tcp 1503 and tcp 1720 should allow
>> you to have incoming NetMeeting calls.
>
> Can't change properties. Last time I unofficially logged on as the
> admin I managed to delete my profile (XP network wizards, don't ask)
> so I'm not going to do that again.
>
> Is 1503 only used to establish, or is it needed during the call.
"Full" NetMeeting calls are really two calls in parallel - and H.323
audio/video call and a T.120 data call. TCP 1503 is used for the T.120 part
the call ( everything .. call establishment and data transfer). TCP 1720 is
used for call establishment/control for the audio/video call. During call
establishment a series of other ports are negotiated to do audio/video data
transfer
> during then the Firewall can't be blocking 1503 as calls from the
> laptop work.
Because it can accept the incoming call you mean -- yes I would guess that
too.
>Searched on google and found Microsoft Knowledge Base
> Article - 158623 which says
>
> 'In addition, some firewalls are capable of passing through TCP
> connections on specific ports and secondary UDP connections on
> dynamically assigned ports, but are not capable of virtualizing an
> arbitrary number of internal IP addresses, or are not capable of
> doing so dynamically. With these firewalls, you are able to establish
> NetMeeting connections from computers inside the firewall to
> computers outside the firewall and you are able to use the audio
> features of NetMeeting, but you are unable to establish connections
> from computers outside the firewall to computers inside the firewall.'
>
> which is my problem so that might be it, but you'd think the XP wi-fi
> Net Firewall Service would be able to do anything.
I am not sure what you are saying here -- what is the "Net Firewall Service"
in this context -- are you referring to XP's built in firewall or something
else?
>
>> ( I have my wi-fi set to only allow a small set of known MAC
>> addresses access, and run at the highest encryption available, and
>> regularly change encyrption keys but even then there is some risk).
>
> I couldn't find anywhere to restrict MAC addresses, someone mentioned
> these are not supported in AdHoc mode. Is this the case?
Yes possibly -- I had forgetton that you were using that strategy-- I don't
have much experience using ad hoc mode so am not totally sure about issues
there.
-- Brian Sullivan Meeting by Wire ( http://www.meetingbywire.com) ------------ Is your PC protected? -- http://www.microsoft.com/security/protect/default.asp
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