Airport Time Capsle port forwarding

I am running ARD on Mountain Lion. I recently purchased the new 3TB Airport TimeCapsule. I am trying to configure it so that I can use ARD from work to remote into my MacPro at home, I have setup port mapping but it will not connect. What am I doing wrong?

For the port mapping.. See Tessarex documents and check according to the airport utility you run.
https://discussions.apple.com/community/wireless/airport?view=documents
Failure to connect can be caused by a huge number of things.
Have you tried firstly running ARD on the local network?
Next, what is the setup of the network.. is the TC main router and only router?
How are you getting the public IP of the TC?
Have you tried BTMM and iCloud and check if they work?
Is your work setup behind a firewall? Are you actually able to use ARD using say a 3G wireless connection via your phone?

Similar Messages

Airport Extreme removes port forward settings every reboot

I have set up various port forward settings on my Airport Extreme from OS X Server. However, every time I reboot the Airport, all port forward settings are lost except Contacts, Calendars, and DNS. It gets very troublesome to constantly readd all my settings in there. Port forwards are the only settings that are lost.
Please help!

I found the issue – and it's fairly simple and obviously really. I'm guessing you were adding the ports from OS X Server in the order they are listed within Server.app (where they are listed in alphabetical order). After Calendar, Contacts and DNS is "File Sharing".
If this is enabled, whilst File Sharing is enabled on the AirPort Extreme, the port forwarding entry for File Sharing, and anything below is removed.
Simply disable "File Sharing" from AirPort Utility before continuing (as recommended by Server.app when setting up the service for File Sharing).
I understand you replaced your AE and no longer have the issue – I thought I'd leave the explanation should others encounter it.

Time Capsule: Port Forwarding Issue and DHCP with Westell 6100g Modem

Ok two issues as of right now, but more down the road i think... Anyways, number one, i would like to be able to backup my computer using time machine and my time capsule.. Right now it works properly when inside the local network, was wondering if there was a way to backup when outside the network... i travel a lot and always have my macbook pro with me.. Also, i have a USB hard drive connected to the usb port on back of time capsule but its not showing up anywhere... is that only for printers??? that's not such a big deal, but would be nice to have access to that hard drive from multiple computers... OK so part two of my issues is, i have a WESTELL 6100g modem for DSL verizon service, which is crappy, but that's besides the point, it is a modem/router, so i have the time capsule connected directly to that westell.. the westell only has one Ethernet port, so that's wired to time capsule and then my computers are connected wirelessly and wired through the capsule. It seems that the westell is distributing the IP's and is controlling the port forwarding and what not.. I have tried a few things to give control to the time capsule but that didnt work.. i followed these directions on the web page http://www.dslreports.com/faq/vz/4._Hardware#13600 but it didnt work properly, i couldn't log onto the web at all.. Maybe im doing something wrong.... Anyways, what i really want to do is control everything that the westell is controlling right now with the time capsule... i want to give out IP's and also control port forwarding with the capsule.. Any way of getting that accomplished would be AWESOME... I'm somewhat intelligent when it comes to computers so i should understand everything you are talking about... please help!!!

wattabing wrote:
Ok two issues as of right now, but more down the road i think... Anyways, number one, i would like to be able to backup my computer using time machine and my time capsule.. Right now it works properly when inside the local network, was wondering if there was a way to backup when outside the network... i travel a lot and always have my macbook pro with me.
If you have Back to my Mac (available online service from Apple's MobileMe), then you can perform the following actions with your Time Capsule remotely,
1. Remote disk access to both the Time Capsule disk and a compatible disk connected via the Time Capsule's USB ports.
2. Remote configuration.
Also, i have a USB hard drive connected to the usb port on back of time capsule but its not showing up anywhere... is that only for printers???
Printer, hub, or compatible disk.
http://support.apple.com/kb/HT2421
Anyway, it could be a setup issue for you, assuming you have Back to my Mac (MobileMe) then the procedure for Time Capsule services is shown in the following Apple support kb
http://support.apple.com/kb/HT3486
and for USB disk please see the following Apple support kb
http://support.apple.com/kb/ht2426

Time capsule port forwarding problem.

I'm trying to portforward minecraft the game to my LX195 hp mediasmart home server but everytime i do 25565 FOR all of the public and private UDP and TCP's and update it with my home servers static ip it doesn't work i always use canyouseeme.org to check if it's open and 25565 (the port) is always closed or connection refused
Please help!
Thanks

1. Find your computer's IP address. In system preferences, click on "Network.: Then click on either Ethernet or Airport (depending on how you're connected to your network). Your IP address will be listed on the right and will likely be something like 10.0.1.3.
2. Open Airport Utility, select your time capsule and select "Manual Setup." Click on the "Advanced" button, then on the "Port Mapping" tab. Click the + to make a new port map.
3. Enter the port mapping information as followed:
Service: Choose a Service (This doesn't matter)
Public UDP Ports: 6890-6900
Public TCP Ports: 6890-6900
Private IP Address: 10.0.1.3 (This must be your IP address that you found in step 1)
Private UDP Ports: 6890-6900
Private TCP Ports: 6890-6900
4. Click "Continue." Type in a description such as "MSN" and then click "Done." The other fields do not mater. Click "Update" at the bottom of airport utility to update these new settings.
Once your airport device has restarted, the ports should then be forwarded.
If this doesn't work properly, it is possible that your time capsule is connected to the internet through another router or router/modem. You must turn off the routing functions on either of the routers.
You can also try enabling the default host in airport utility. This should forward all ports to a computer's IP address. Find it in Airport Utility / Manual Setup / Internet / NAT. Enter your computer's IP address in the "Enable Default Host At:" box and update.

How do I set an Airport Extreme to port forward for a Swann DVR?

I believe I have entered the correct IP address and MAC address. I am having trouble with deciding to enter the media port number, 9000 and the web port number, 85 when I am in the port settings in the Airport Utility. This is for a Swann surveillance DVR so I can view it remotely via my iphone 4s. I am unsure about what to type in the UDP and TCP Port spaces. Any help is appreciated, especially screen shots.

With the help of tech support, I'm all set up now.
Todd:
You have to set up 2 ports to forward on your AE. It will look like this:
DVRhttp
     Public TCP          40XXX
     Public UDP          BLANK
     Private IP             10.0.1.2XX - (The static IP of your dvr)
     Private TCP          40XXX
     Private UDP          BLANK
That's the first, now here is the second:
DVRserver
     Public TCP          49XXX
     Public UDP          BLANK
     Private IP              10.0.1.2XX (same as above)
     Private TCP          49XXX
     Private UDP          BLANK
I'm not 100% sure on which ports are available to open but once you complete the mapping, go to this site http://canyouseeme.org/ and test both ports. If it's open, it will say "
Success: I can see your service on XX.XXX.XX.XXX on port (40XXX)
Your ISP is not blocking port 40XXX.
Now log in to your DVR and make sure in Network/Advanced config you have the HTTP and Server ports matching above. So Server would be the 49XXX and HTTP would be the 40XXX.
That should do it. If you are using the swannview app the settings would look like this
Address XX.XXX.XX.XXX (This is your public IP address. Do not include the port at the end of the IP when using the app. She said if using a win pc and internet explorer you would need to include the port so it would look like this xx.xxx.xx.xxx:40XXX)
Port 49XXX (The SERVER port goes in this field)

Leopard + iChat + Time Capsule Port Forward

Hi,
Here are my settings
OS: Leopard
Modem: Motorola 2210-02
Router: Time Capsule
Macbook
I am trying to use video ichat with my girlfriend in Canada but I can't get it to work. (audio works)
Currently I am using the modem as a Bridge and I forwarded the ports on Time Capsule according to the guide for AEBS (http://portforward.com/networking/static-Mac10.4.htm). However, it's still not working.
Is the problem coming from the port mapping? => in the private ip field should i put the router or the macbook's ip.
Does it make a difference which setting i use as my DHCP beginning address? 10.1.0 vs 192.168.1
Should my dhcp reservations for my macbook (and other laptop) be within or outside the dhcp beginning and end address?
Sincerely,
Adama

It should work just setting it to Share An IP in the drop down.
I am not sure if the set up is exactly the same as a Base Station but you should have a pane like this
http://flickr.com/photos/90943061@N00/2043616510/
10:32 PM Wednesday; March 19, 2008

Airport Ext. Port Forwarding does not work

I am trying to open up UDP ports 500, 1701, and 4500 to point to my local computer since i'm using iVPN. However, Airport doesn't seem to want to open these up. I disabled Mobile Me as per the support document I found and still having issues.
I want to be able to VPN via my iPhone and/or MacBook Pro into my home network.
My Mac Mini is running 10.6.5 with all the latest updates. My Airport Ext has the Wireless N with latest updates as well.
Any help appreciated. I have spent over 2 hours searching on google and could not find any documents that actually got this to work.

To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the iVPN device.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the iVPN host computer>
o IPv4 Address: <enter the desired IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Service: <ignore this for now; it will change to Custom once you start entering values>
o Public UDP Port(s): 500, 1701, 4500
o Public TCP Port(s): 1723
o Private IP Address: <enter the DHCP-Reserved IP address you created earlier>
o Private UDP Port(s): 500, 1701, 4500
o Private TCP Port(s): 1723
o Click "Continue"

Port forwarding Airport Extream

Is there a complete manual for the proper setup and configuration of the latest Airport Extream for port forwarding an I.P. Camera for external viewing. If so can someone direct me oar supply an answer. Thanks in advance.
Apple AirPort Extream Version 7.6.1
iMac 27" 2.8 GHz Intel Core 2 Duo
3 GB 800 MHz DDR2 SDRAM
Jose

To successfully access an IP camera on the local network from the Internet, the following basics need to be taken care of:
Install the camera(s) and verify that you can access them from the local network.
Configure port mapping/forwarding on your router. Typically, IP cameras require at least two ports: 1) A web port for administering the camera; Usually TCP port 80, and 2) A streaming port to broadcast the camera video feed; Usually UDP port 9000. Note: You should check with your camera's documentation for the exact ports required.
If the camera is attached to a computer, you will need to configure the computer's firewall to open the same ports as in step 2 above.
Verify that your modem is in bridge mode, i.e., if the modem provides NAT & DHCP services, turn them off.
Test your network. Use CheckIP to determine your router's current WAN-side (public) IP address. Then, from a remote location (not from a computer on the local network), use the DynDNS Open Port Tool to verify that the required ports are open. Success is an "Open" response from the Tool.
The following are general instructions on how to configure the AirPort for port mapping:
AEBSn - Port Mapping Setup
To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the host device.
AirPort Utility > Select the AEBSn > Manual Setup > Internet > DHCP tab
On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
Description: <enter the desired description of the host device>
Reserve address by: MAC Address
Click Continue.
MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the host computer>
IPv4 Address: <enter the desired IP address>
Click Done.
2. Setup Port Mapping on the AEBSn.
AirPort Utility > Select the AEBSn > Manual Setup >Advanced > Port Mapping tab
Click the "+" (Add) button
Service: <choose the appropriate service from the Service pop-up menu>
Public UDP Port(s): <enter the appropriate UDP port values>
Public TCP Port(s): <enter the appropriate TCP port values>
Private IP Address: <enter the IP address of the host server>
Private UDP Port(s): <enter the same as Public UDP Ports or your choice>
Private TCP Port(s): <enter the same as Public TCP Ports or your choice>
Click "Continue"

Setting up port forwarding

Does the most recent generation of the Airport Express support port forwarding? If so, could someone please assist me with this? I have a NAS device I'd like to access from outside my network.
Thanks!

Yes it does. Please check out the following AirPort User Tip for details on how to configure the AirPort for port mapping/forwarding to get you started.

Port forwarding 113

Hi,
So Every time i port forward 113 when my power goes out sometimes my computer will change ip and i have to keep logging in and changing to ip the forwards 113, on my other routers belkin i was able to make it keep my computer always with the same ip, i cant figure out how to do this with this router and it says something about port 113 in the options i assumed it was so i could keep all ips open port 113 is there an way to do that? to make all ips connecting to the router have the port open?
one of the two would be very good to have either keep my pc with the same ip or have all pcs connecting open port 113.
i have the
Simultaneous Dual-Band Wireless-N Gigabit Router WRT610N router
TIA
Solved!
Go to Solution.

The function you are looking for is called "DHCP Reservation" and is right there on the main setup page.
It's impossible to open a port for more then one LAN IP address. Multiple LAN IP addresses would make no sense. This would mix communication of all your computers on this port...

How to Port forward your router via browser

I Am having trouble port forwarding 19132 and I tried using airport extreme to port forward but everyTime I connect using my external ip it just fails.
i Have port forwarded the port, and I did it correctly, hence I watched a few videos before and after. so I need to know how to port forward 19132 via browser.
i Learned how to open the the config of the router via browser, or so I thought. I need to allow google access to my network, but I don't know how.
please help.

This is for Apple routers which do not use browser setup.. you must use the airport utility for any setup.
There is particular advice by the section GURU.. Tesserax on how to port forward in apple routers.
Finding the tips is now an exercise though.
AirPort - Port Mapping Basics using AirPort Utility v6.x

How do I port forward or open a port on the Airport time capsule to hook p a security system?

I have an airport time capsule and a security system. The installer doesn't know anything about using routers etc, especially on a mac. They say I have to port forward or open a port specifically of this device. I have very few skills when doing this IT type. Is this hard to do? Can I do it myself? He wants to get an IT guy out? $55 an hour, how long would it take? Thanks in advance for anyone who can help!

The method is here.
AirPort - Port Mapping Basics using AirPort Utility v6.x
If you need to get someone in, it depends.. The TC can be recalcitrant.. due to your setup of it following the apple guides.. and it depends on the security system and how simple that is.
There are multiple issues.. for example how do you find your IP address from the web when you have dynamic IP from your ISP.
Do you intend to setup dynamic DNS? Can the camera /dvr system handle Dynamic DNS?
I recommend you read very carefully the instructions for what has been installed.. because merely opening the port is only a small part of the issues involved in remote access to the security system.

Port forwarding Time Capsule Airport 7.6.3

Network problems. I want to run a free software called Maptool 1.3b89. I created some sweet maps in OS version 10.7.5, and assembled players, but I can't connect with other computers. I have the Time Capsule (router) with Airport version 7.6.3, updated, Cisco cable modem. I updated Java when I installed Maptool, less than a month ago.
The Maptool Networking FAQ says UPnP is by far the easiest approach, furthermore,"(An alternative is called NAT-PMP, but they are functionally the same so the second won't be mentioned again.) "This sounds as if one can plow ahead and get the same result. Believing they were functionally the same, I enabled NAT-PMP, attempted to connect with the UPnP box checked, and Maptool returned: "no internet gateway devices found UPnP port mapping will not be available."
So I asked, "If I get the server enabled, will it work for windows, or just for mac clients? Is this where it is functionally the same?"
Here is the response, though I'm not certain it addresses my concern: "The NFAQ is incorrect if it says that NAT-PMP is the same as UPNP. NAT-PMP is a new protocol from Apple that only applies to the AirPort routers, although a lot of other routers now support it as well. I'll fix the FAQ. There will be a b90 build either tonight or tomorrow that will fix the UPNP bug, but it won't help with NAT-PMP since it's a different protocol. I'll see if I can find a way to support NAT-PMP but it's not likely to be soon."
Does that translate to, give up or get a different computer, Mac user?
I searched these forums. The suggestions aren't talking about version 7.6.3 of Airport. They tell you to go to port mapping, which is not an option/selection offered. The most useful post says my version of Airport is a toy hammer with no functionality, go get old Airport, version 5.6. Did that using Unpkg. Did not run both airports at the same time. Followed another post that referenced Bit Torrent, thus, I enabled Nat-PMP, and mapped all four ports to 51234, the default port for Maptool. Airport 5.6 returned: The airport utilty was unable to find your Airport wirless device after restarting, the settings for this wirless device have successfully updated, but there was a problem rejoining the wirless network or finding the Airport wireless device. you may need to select your network from the Wi-fi menu and try again.
Lost wireless. Did a backup from Time machine and still couldn't connect wirelessly. Restarted and the wirless returned.
The NFAQ says UPnP won't work with port forwarding (at the same time) but that is what seems to need to happen on a Mac. I tried portforward.com. Does not have my router. Followed instructions for the only featured Apple/Macintosh product, Airport Extreme. Not even close.
I have clicked all the advanced buttons and menu choices through Airport and through (settings)network, and figured out you can click on the + sign. The outdated portforward.com info says, "enter both the public and private boxes with the same port number," and shows two boxes, but I have four boxes: IPV4 port mapping, public (and private) UDP ports, Public (and private) TCP ports. Should I fill all four with port 51234 and use the provided IP address?
I can't make my IP address static. I followed the portforward guide and lost my internet connection. Portforward Open Port check tool says, "this program cannot be run in dos mode," with a giant code strip following. Excuse my ignorance, but why is a dos program set up to run a test that is embedded in a Macintosh installation guide? Is that an emulator or a different dos? Shouldn't it be Unix or something? It says if I have no internet connection (which I don't at this point) to restore my original settings. Futile. The user guide offered here isn't my software version but it says to enable NAT-PNP and give the ip adress to the host, but Maptool isn't going to use this special IP because it will only see the public one, right?
I was tempted to buy one of their products like PCconfig but here is what they say, "Instead of manually configuring your network router, just pick your app from a list and update your router with a single click." but they don't bother to indicate whether it works for mac, don't feature my router, and it says you must pick an app, but Maptool is not featured in the giant list of users that, "you are forwarding ports for." I tried to download PF Setup Static IP Address but the download was a Windows app, so I couldn't run it.
I have tried just enabling Nat-PMP by itself, Canyouseeme.org returns "firewall or ISP is blocking certain parts, error, I could not see your service on (my IP address) port 51234." I have tried port mapping by itself to port 51234, which causes the time capsule to crash, requiring a backup and reboot to restore the wireless network, and both together, which is contrary to the way it is supposedly done with UPnP.
If I installed Windows that wouldn't change how it networks. What is my next step, buy another router?
Downloaded Hamachi. The tutorial no longer launches. The tech data has removed the mac screen shots and not replaced them, but I can see the headings and blank spots where they should be. I assume they aren't supporting new mac users. Logmein was just as obscure. I don't feel very confident about either product. The freeware Virtual Network Provider gets reviews like, "hard to use," and "complex interface."
Thanks in advance for your consideration.

If you want to use maptool and it is only going to work with UPNP type router. Then simply replace the TC with a standard router.. it is less than $100 for a very reasonable one like Netgear WNDR3800 which has 3rd party firmware like dd-wrt, openwrt and gargoyle as well as netgear which is pretty but lacks features.
Bridge the TC and keep it as backup target for TM which is what it does best.. and wireless AP for apple devices.

Trying to Port Forward Airport Extreme 802.11ac using Airpot Utility 6.3.2

Hello kind experts. I am finally getting around to replacing my old BEFSR81 Cisco Router with an old Time Capsule attached with the Airport Extreme 802.11ac. The BEFSR81 also had 8 ports, so I have 8 hardwired locations throughout the house. I have a couple of IP cameras for which it was easy to port forward on the Cisco (just click on the port range forwarding tab, type the start/end ranges (which are identical) and the assigned IP address). Everything has been working well for years. Here's what I wish to do with the new setup: Cable Modem -> Airport Extreme -> Dumb gigaport switch with the hardwires connected to it.
When I go to Airport Utility (6.3.2) -> Network Tab -> Port Settings -> "+", the following comes up:
Firewall Entry Type (Defaulted to IPv4 Port Mapping)
Description (5 pull down choices)
Public UDP Ports : _________
Public TCP Ports: __________
Private IP Address (I take it that is where I enter the IP address for each camera, e.g. 192.168.1.xxx)?
Private UDP Ports: __________
Private TCP Ports: __________
I am obviously not a technophile, especially when it comes to networking, but was able to create my old setup.
Any advice on whether or not my configuration is appropriate and what exactly I need to put in the port fields would be greatly appreciated!
Thanks in advance!

To successfully access an IP camera on the local network from the Internet, the following basics need to be taken care of:
Install the camera(s) and verify that you can access them from the local network.
Configure port mapping/forwarding on your router. Typically, IP cameras require at least two ports: 1) A web port for administering the camera; Usually TCP port 80, and 2) A streaming port to broadcast the camera video feed; Usually UDP port 9000. Note: You should check with your camera's documentation for the exact ports required.
If the camera is attached to a computer, you will need to configure the computer's firewall to open the same ports as in step 2 above.
Verify that your modem is in bridge mode, i.e., if the modem provides NAT & DHCP services, turn them off.
Test your network. Use CheckIP to determine your router's current WAN-side (public) IP address. Then, from a remote location (not from a computer on the local network), use the DynDNS Open Port Tool to verify that the required ports are open. Success is an "Open" response from the Tool.
Check out the following AirPort User tip for configuring port mapping on an AirPort base station.

Time Capsule disconnects internet when using web server through port forwarding

My current config is: 2TB Time Capsule running 7.6.3, Mac Pro running Lion (10.7.5), MacBook Pro running Mountain Lion (10.8.3), and a couple of MacBook Pro Retinas running Mountain Lion. My current ISP is Comcast.
I have the Time Capsule set up to port forward port 80 to the Mac Pro for the purpose of running a web server. Most of the traffic is shuttling fairly large m4v files back and forth to work (work product from video editing work). I can reach the webserver on the Mac Pro just fine from the outside world, and can list files in the directory just fine. When I initiate a download (via right click on a link, "Save As..." or whatever), the Time Capsule reports that the Internet has been disconnected, and all machines inside my network lose access to the outside world. I have to either power cycle the Time Capsule, or disconnect/reconnect the Cat-6 cable between the cable modem and the Time Capsule to re-establish the connection. Interestingly, the download continues and completes on the other end without issue (so, the connection is actually still there!).
Before switching to Comcast, I was on AT&T Uverse - Uverse includes a router, so I had the TIme Capsule set up in Bridge Mode. That worked fine. I also have an older 500GB 1st generation Time Capsule. I set it up with the same config as my 2TB TC, and it shows the exact same behavior - internet disconnects upon initiating a file download through a forwarded port. I then hooked the Mac Pro up directly to the cable modem. I can initiate a download without issue, and I continue to stay connected to the Internet without problem. Called Comcast anyway - they report no errors on the line, but reset the whole device chain anyway. No change in behaviors.
I tried downgrading the Time Capsule software to 7.6.2 (the earliest version that came on it). No dice, same behavior.
So... I called Apple. Complete and utter FAIL. Apple Support reports that they have no training in the port forwarding features of the Time Capule or Airport products, and cannot help me resolve the issue because of that. So, I have a $300 router that apparently cannot perform a simple routing function (download through a forwarded port), that I cannot troubleshoot (because Airport software v7 is an epic fail in that regard), made by a company who cannot support it - and everything this $300 device is doing can be done by a $50 device with a $100 external hard drive?
Do I understand this situation correctly? What have I missed in trying to troubleshoot this thing?

Apple Support reports that they have no training in the port forwarding features of the Time Capule or Airport products, and cannot help me resolve the issue because of that. So, I have a $300 router that apparently cannot perform a simple routing function (download through a forwarded port), that I cannot troubleshoot (because Airport software v7 is an epic fail in that regard), made by a company who cannot support it - and everything this $300 device is doing can be done by a $50 device with a $100 external hard drive?
Do I understand this situation correctly? What have I missed in trying to troubleshoot this thing?
Excellent summary.. I think you have covered all the salient points most thoroughly.
Port forwarding on the TC I would put into the category of "epic fail"
I have a nasty feeling it just doesn't work in many cases. Clearly from your situation the port is forwarded correctly.. it is the actual download that is causing the device to crash.. which is probably not the port forwarding itself that is at fault but rather the external link and opening another port for the download to happen.
Many of the issues were caused by using icloud and btmm.. which would work a lot better btw. Although the hassle there is needing to offer that as a service to any Tom Dick or Harry.
Let me suggest a work around or other things to try.
I also have an older 500GB 1st generation Time Capsule. I set it up with the same config as my 2TB TC, and it shows the exact same behavior - internet disconnects upon initiating a file download through a forwarded port.
Use 5.6 utility.. more info below. And take the firmware of this unit (Gen1) back to 7.5.2 (before icloud mess ups in 7.6).
You can go back to 7.5 firmware also in Gen4 TC if it is more than about 14months old.. Simply hold down the option key when you select firmware and the old versions will show up. If your TC came with 7.6.1 (the 7.6.2 was withdrawn as it was even bigger failure than 7.6.3). then you cannot go back.
You might also find downloading via http is not as reliable as using FTP.. FTP is a better and more efficient protocol. It should be no problem to setup ftp server on the mac pro to allow download via ftp even with a browser.
But in the end.. your $50 router suggestion.. well perhaps a little more than that.. $80-100 will work very well.. also this router can be setup with a Hard Disk and offer the files to the internet via FTP.. without needing full network access to your internal network.
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. it is very simple.. drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. drill down.. applications utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
You cannot uninstall 6.1 (now 6.2 if you updated) so don't try.. and you cannot or should not run them both at the same time.. so just ignore the toyland version.. the plastic hammer.. and start using 5.6.. a real tool.
For screen shots see this post.
https://discussions.apple.com/thread/4668746?tstart=0

Airport Time Capsle port forwarding

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