Remote desktop not connecting to client computer.

Hi All.
I have 3 macs on our LAN. I'm trying to control one of them from a remote location. I have forwarded UDP and TCP on 5900 and 3283 in the router (Sitecom) and the firewall of the target mac is opened on the same numbers. This set up used to work with a netgear router, no problem, now though we can't connect from outside the LAN. I can use another comp inside the LAN to control the target computer. I tried entering my external IP into ARD to loop back into the LAN and got no joy. A box popped up asking me to enter a user ID and password, which I entered correctly for the target comp but the IP of the target comp remained at 0.0.0.0. The remote admin computer can copy files to the target comp via ARD. All this points to the router as being the problem but I have forwarded all the proper ports to the right IP address on the LAN so I'm stumped. Can any one slap me round the head and show me which button to press? TIA Nick.

Hi Jason,
It is often difficult to explain a problem, so don't worry. Let's break it down.
Firstly, does ARD work when you are at your place of work? - can you control a mac?
If so, this is good.
Ok, from work you need to access your router and find your public IP address, you only have one. You will often find this is the status page.
The IP is usually a class A address starting with 80 or 90, but this obviously isn't always so, depending on your ISP and region. make sure you are not using the router's local lan IP! You will also need to make sure your home router is allowing ARD ports through!
You now need to port forward the ARD ports to the mac you want to control, which I believe you have done. For example, port 3283 > IP address of remote mac.
I know when I did this, I just opened up all ports for a couple of minutes just to get it working, then I locked access down. If you havn't done so then you need to enable remote management on your work router so you can configure it at home.
On your mac at 'home' open ARD, and go to file> add by address and enter the PUBLIC IP address. You will also need to enter the admin user name and password for the said mac.
That's it, you should have control.
If your macs at work and home have a firewall enabled then you will need to update your rules.
Good luck!

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Hi Jason,
It is often difficult to explain a problem, so don't worry. Let's break it down.
Firstly, does ARD work when you are at your place of work? - can you control a mac?
If so, this is good.
Ok, from work you need to access your router and find your public IP address, you only have one. You will often find this is the status page.
The IP is usually a class A address starting with 80 or 90, but this obviously isn't always so, depending on your ISP and region. make sure you are not using the router's local lan IP! You will also need to make sure your home router is allowing ARD ports through!
You now need to port forward the ARD ports to the mac you want to control, which I believe you have done. For example, port 3283 > IP address of remote mac.
I know when I did this, I just opened up all ports for a couple of minutes just to get it working, then I locked access down. If you havn't done so then you need to enable remote management on your work router so you can configure it at home.
On your mac at 'home' open ARD, and go to file> add by address and enter the PUBLIC IP address. You will also need to enter the admin user name and password for the said mac.
That's it, you should have control.
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I have set up new iMac with OSX.8.3 and released the remote administration as I did before on many other devices.
In the Apple Remote Desktop window I can see the computer and it presents itself as any other computer also, to which I have access to (available, current user etc)
However, when I try to connect I get in the LAN immediately "connection failed".
From outside via VPN I get this message:
Please make sure that the remote administration (in System Preferences "Shares") is enabled on the computer to which you want to connect. Also make sure that your network connection is working correctly.
Here, after all, is an indication, albeit an improper. I can see the computer in the list of the ARD window and that it is available. But cannot connect either
I have tried with and without firewall, with no success. In addition, in the firewall the Remote Administration is enabled.
I am little perplexed. (With TeamViewer I can connect)

Thanks a lot for your help
TeenTitan wrote:
while connect to the local network.
is the computer on and awake when you try to connect?
Yes it is
on the new imac, have you verified remote management is enabled?
Yes I did (the computer IS visible in the Remote Desktop list, I can see what app is running, which user account is active )
if no, have you tried enabling it? (apple menu, system preferences, show all, sharing, check remote management)
its correctly done
If yes, have you tried unchecking it, and then re-checking it?
Will try it
if still no, is the user your try to connect with listed in remote management?
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if so, what about deleting and then re-adding the user your try to connect with?
Will try that
if no, what about adding the user to the list?
I was creating already a new user, no improvement
while connected to the same lan as the imac. Have you tried deleting the computer record for the imac from your ARD, and re-adding the client?
Will try that
Is both computers connect to the network the same way? if so, what are the IP address you get on both computers?
yes they are. We have manual attributed IPs in the same range

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I am having trouble connecting remotely to my work's servers. It was previously working fine, but today I upgraded to Windows 8.1 and now I'm getting an error. It says my credentials do not work. Now, my username and password are both still
valid, as they were used to log in from another computer. I initially thought it was that the firewall was preventing me from connecting, but I enabled the Remote Desktop app and it still does not work.
I'm kind of at a loss on where to go from here so any help would be appreciated.

Hi,
Please try the method below to fix this problem for test.
Open Group Policy, then navigate to
Local Computer Policy\Computer Configuration\Administrative Templates\System\Credentials Delegation\
Open Setting Allow Delegating Saved Credentials with NTLM-only Server Authentication, set it to
Enabled click on button Show... and in Show Contents
window add Value TERMSRV/terminal.server.com. Close all windows by pressing
OK.
In the end, Open cmd and enter gpupdate
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TechNet Community Support

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I dont quite understand, problem is that it doesnt even connect to the server it basically times out while trying to connect, at first i thought maybe it was because there are no users with licenses added but the error would be different when connecting,
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- who stole my beer? -

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Hello,
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Hi,
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