Videochat and Screensharing working. but not with ONE person

Question

ok this is a tricky one. i have a mbp. my father has an imac and various friends have mbps or mbs.when i'm at my parents home ichat av between me and my father is no problem. (so far ok, because it is intern).both, my father and i are able to videochat with everyone from MY PARTENS HOME.
when i'm back to my apartment, i can chat with everyone, except my father! now to the interesting part. if i ask a friend to start videochat and invite my father we're both in. so the problem basically is the connection between us. when someone other is host, there's no problem.
i double checked my network connection and the network connection at my parents home. but i was always able to chat with everybody, but my father. when i was in holiday i had the exact same problem, just to stress out, that i'm not too stupid to set up the network/ports. in fact ichat av is currently working without even mapping a single port.
so has anybody ever had a similar problem (i already contacted my apple retailer=never heard of something like this).
to sum up: ichat av working in both homes without any problems. the only thing not working is the connection between my mbp and my fathers imac.
thanks a lot
jacques
Message was edited by: Jacuqes

Answer 1

Hi,
On the first post I would have said it is about the way you routing device is doing NAT and your father's and your not liking the way the other is doing NAT
See this older bit on my Web Pages http://www.ralphjohns.co.uk/page15.html#CertainBuddy
From there....
(I am Presuming you are using your same Screen Name ?)
Edit: see bottom first.
I would cross check the port in iChat > Preferences > Accounts > Server setting tab on both the test Mac User and your normal Mac User account.
Even if the Test Mac User account is using port 5190 then make sure the Normal Mac User account's iChat is.
If 443 is the successful one try that.
Also look at whether it is using the SSL option to login.
I would also check System Preferences > Security > Firewall on both as a comparison.
iChat only works if Allow All or Allow Specifics and iChat is added to the List (it is not considered and Essential)
Then go to System Preferences > Network and see if the DNS servers are being shown on the Normal account when they are on the Test one.
In the Normal Mac User's Account iChat check that in the Video menu the Camera Enabled item is ticked and that Screen Sharing is Allowed.
The camera is enabled by default but might have got changed.
As you wanted to Screen share you may have turned it on in the Test Mac User's iChat.
Deleting the .plist com.apple.ichat.plist would have deleted any Screen Sharing setting in the Normal Mac User.
Back to System Preferences > Network.
Is there any chance that the two (Mac User)accounts are using different IPs from your Modem or router ?
In System Preferences > Sharing on the Normal Account check that Internet Sharing is Off.
On reviewing this post before posting this actually seems the most likely.
9:01 PM Tuesday; August 12, 2008