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FAQ: Establishing connection |
  
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FAQ: Establishing connection |
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Why can't I connect with the remote Host?
How to find out IP address of the remote PC?
How to access a remote PC behind the firewall?
How to control a PC with dynamically assigned IP address?
How to access a remote PC behind the router?
How to connect through the Proxy Server?
Why can't I connect with the remote Host?
Possible reasons of the problem in Account Connection mode:
1. Host Module is not started on the remote computer.
2. "Use Account Connection service" option is disabled in the Host Module settings.
3. Remote PC is turned off or has no Internet/LAN connection.
4. Firewall or Antivirus protection on the Host/Admin computer is used (read more...)
5. You are accessing Internet via Proxy server (more...)
Possible reasons of the problem in Direct Connection mode:
1. IP-address/name of the remote Host computer was changed (it is dynamical) or you try to connect via incorrect IP address.
2. Host Module is not started on the remote computer.
3. Remote PC is turned off or has no Internet/LAN connection.
4. Firewall or Antivirus protection on the Host/Admin computer is used (read more...)
5. Host computer is located in the network behind the router and you want to access it via Internet. (read more...)
You can test whether you have direct connection with the remote PC using a Ping command in system console, example:
ping 10.0.0.1
ping myserver.mycompany.com
How to find out IP address of the remote PC?
If you want to connect to remote PC, but don't know remote IP address, please follow the next instructions:
| 1. | User of remote Host PC should move his mouse pointer over the Host Module tray icon. The tool tip will show the list of IP addresses. |
| 2. | Remote user should provide you with IP address by phone or e-mail. |
How to access a remote PC behind the firewall?
Remote connection is impossible when Firewall blocks our program. You don't need to configure internal Windows Firewall as our program configures it automatically, but third-party firewalls may require manual configuring.
1) If you are using Account Connection mode, please, configure firewall to allow our program outgoing connections via ports 443 and 80:
Please, add the following modules into Firewall allow list on the Host machine:
c:\program files\remote desktop control 2\apc_host.exe
c:\program files\remote desktop control 2\apc_hostConig.exe
Please, add the following modules into Firewall allow list on the Admin machine:
c:\program files\remote desktop control 2\apc_admin.exe
2) If you are using Direct Connection mode:
Please, open TCP ports 6279 and 7279 on the Host PC and allow incoming connection for the following module:
c:\program files\remote desktop control 2\apc_host.exe.
Add this file into the Firewall allow list
Please, allow outgoing connections via ports 6279 and 7279 on the Admin PC for the following module:
c:\program files\remote desktop control 2\apc_admin.exe
Read more here: Firewall Configuration
How to control a PC with dynamically assigned IP address?
Our software has two connectivity modes: Direct Connection and Account Connection.
You will never have problems with IP addresses if you use Account Connection mode as you don't use IP address to connect with remote PC in this mode.
But if you use Direct Connection mode: IP address of Host Module could be dynamically assigned; therefore you should find it out after the remote PC connection to the Internet. Someone on the remote side could tell you the remote IP address by phone or e-mail for example. After that you can connect to the remote computer using that IP address.
If you are often compelled to be connected to the remote computer with a dynamically assigned IP-address, and nobody on the remote side can tell you the current IP, you can use some of services, such as www.no-ip.com. It will help you to know the IP address of the remote PC even if it often changes.
How to access a remote PC behind the router?
It is possible when Host computers are located in the LAN behind a NAT based router and you want to control them via Internet.
You will not have any problems and obstacles if you use Account Connection mode to access these PCs as router doesn't require configuration in this case.
However there is difficulty in Direct Connection mode: computers have no public IP addresses, i.e. addresses are private (192.168.x.x for example); and only a router has a public IP address (210.20.160.22 for example).
You need to configure "Forwarding" on the router/firewall to control LAN computers from the Internet. You should configure the router to forward connections from a port on the router to a specific IP address and port of the target computer in your internal network. It is necessary to assign unique port on the router for every computer you need to control.
Remote Desktop Control uses 2 TCP port 6279 and 7279 by default.
How "port forwarding" works?
Terminology:
Port on the network PC is a private port. Network PC is private.
Port on the router is a public port. Router is public.
Router should forward traffic from its different public ports to different private computers
Let's consider an example:
You have local network with 3 PCs and 1 router. Admin Module is located anywhere in the Internet, but not in this network.
You want to control network PCs via Internet when you use the admin's PC.
For example, public IP address of router is 210.20.160.22.
Private IP addresses of network PCs are: 192.168.0.2, 192.168.0.3, 192.168.0.4
In this case the configuration of the "port forwarding" can be the following:
210.20.160.22 : 6279 -> 192.168.0.2 : 6279
210.20.160.22 : 7279 -> 192.168.0.2 : 7279
210.20.160.22 : 6278 -> 192.168.0.3 : 6278
210.20.160.22 : 7278 -> 192.168.0.3 : 7278
210.20.160.22 : 6277 -> 192.168.0.4 : 6277
210.20.160.22 : 7277 -> 192.168.0.4 : 7277
For connecting to some network PC via Admin Module you always use IP address of router (210.20.160.22), but unique pair of port numbers (6279 and 7279; 6278 and 7278; 6277 and 7277).
You enter these values into the Admin Module address book ("Add new PC" button).
Of course, on each Host PC you should change default ports in the Host Module settings.
In this example for connecting with computer 192.168.0.3 you should enter in the admin address book:
IP address: 210.20.160.22
ports: 6278 and 7278
On the Host PC 192.168.0.3 you should change default ports (via Host Module settings) to 6278 and 7278.
You can read how to configure your router's model here.
How to connect through the Proxy Server?
There is a way of connection to the remote Host through a HTTP Proxy server. It is HTTP-tunneling.
For realization of this opportunity you can use special external software, for example:
HTTPort (http://www.htthost.com)