Port Mapping Problem

Question

Port Mapping Problem

I recently ran into an issue with my iMac and being able to see the computer outside of my local network.

I have a 27" iMac (mid 2011) and an airport extreme. I have the iMac set up using wireless, and in the airport I have it configured to use a dedicated router address. I have an iPhone and do not want to take up the space on the iPhone with music so I have been successfully using, for the last year and a half now, an app called AudioTap for iOS to stream my music over 4G right from the iMac. On the iMac you have to run a helper app called MediaTap that allows you to automatically port map. I also for whatever reason just opened the port that shows is the default port (which is 48848) on the airport extreme's port mapping using port 48848 with my iMac's dedicated router address. This has worked for over a year, and about a week ago I left for work one morning and the iOS app said it couldn't connect. It happens occasionally something goes wonky and I will have to reset it when I get home and everything is fine again. I got home and opened MediaTap and it said there was an error in configuiring the port and couldn't get access from outside my local network. There isn't a single setting in my network that I have gone in and changed; it just stopped working. I have looked at my setup in the airport extreme, my network settings on the iMac. I cannot figure it out.

After a few days of messing with it I opened the app on my iPhone and I looked at my connections and I have one configured for my macbook which has little to no music on it, but I thought well maybe I will try that out. I opened my Macbook and everything worked flawlessly. So I went back to the iMac and went to canyouseeme.com and could not connect to any port on my iMac that I know is open. So the problem lies somewhere on my iMac.

Does anyone know of anything I can do to troubleshoot this?

iMac, Mac OS X (10.7.1), 27" Quad-Core i7 256GB SSD 8GB RAM

Posted on Feb 26, 2013 5:58 AM

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Answer 1

Feb 26, 2013 7:34 AM in response to William Laughlin

I should also add that back to my mac does work from my macbook to my iMac. That seem to be the only outside connection I can make.

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Answer 2

Feb 26, 2013 7:25 PM in response to William Laughlin

I have the exact same problem and can not figure out what is wrong. I can use other programs that need forwarded ports but Mediatap will not see that port. And when I check http://www.yougetsignal.com/tools/open-ports/ for the port, it says it is closed. My guess is that something happened on my computer to stop Mediatap from being able to actually access that port. I know that when you don't have the program running that is trying to access the forwarded port that it will say it's closed. So, even though Mediatap is on and running, I feel like my Mac isn't letting it actually connect to anything. In fact, I can't even connect to it locally, on the same wi-fi network which doesn't call for any forwarded ports.

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Answer 3

Feb 26, 2013 7:25 PM in response to nathansmart

Oh, and my firewall is completely off so I don't know what could be blocking it.

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Answer 4

Feb 26, 2013 7:32 PM in response to William Laughlin

So, just to test it out, I went to my other program that uses port forwarding and changed it to the same one that Mediatap uses (48848) and when I checked the port it was now saying it was open. So, it's clear that something is restricting Mediatap from accessing the internet but I can't figure out what it is!

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Answer 5

Mar 5, 2013 12:01 PM in response to nathansmart

They just updated the mediatap app that runs on your computer that fixes the issue. It was aparantly an issue when you installed the new iTunes. It worked form me on my Macbook because I never updated iTunes, but I did on my iMac! That is what was the most confusing part of it not working for me. Work on one but not the other.

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Answer 6

Mar 6, 2013 10:24 AM in response to William Laughlin

Awesome - it worked for me too. I knew it was them and not me. 🙂

All the support stuff on their site makes you feel like an idiot for even asking.

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