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LoopBack Issues

 Loopback is necessary in Opensimulator if you are going to be running on the Hypergrid. The usual symptoms is being unable to log in to the server after switching to a Public IP or a Dynamic DNS name. If your router does not support loopback, which is common,  you can install a simple fix so it can run a viewer. The loopback adapter lets a viewer on the server reach itself, as the loopback via the router is not functioning.

Testing for LoopBack

If you are reading this, it is probably because you already know loopback is not working and clicked the Help menu to get here. So you can skip down below and go right to "Installing the Loopback Adapter".

You can manually test for loopback by starting Opensimulator, then use a web browser to navigate to Enter port 8002 and click Check Port. This must work. if not, fix the port forwarding issues and come back and try this test again.  You may need to Open Ports in the firewall or disable it on the PC temporarily.

Your ports are known to be working now, so go get the Public IP of your system from Use a web browser to navigate to http://(Public IP):8002. Use your Public IP where it says (Public IP).

You should get a log in page.  If you get this page, loopback is working. If you do not get this page, loopback is not working in your router.

Fixing Loopback

There are two ways to patch up a router that has no loopback. Both have one major issue, the viewer MUST run on the server.  You cannot log into your server on the same LAN from a different PC is the router has no loopback and you use one of these two methods.   If you must log in from a second PC on the same LAN, and also  have hypergrid access  you must replace your router.  Also, if you do not need access to the hypergrid, you have no need for loopback, just use the Servers IP address for its DNS name, or leave the DNS name blank.

Method A) Add a  Windows Loopback Driver

You will be able to teleport to your local grid when logged into another remote grid when you are using a viewer from the server. 

1. Click Start, then type cmd in the search box and press Enter.
2. In the command prompt, type hdwwiz.exe and press Enter.
3. Click Next.
4. Select Install the hardware that I manually select from a list (Advanced), then click Next.
5. Select Network adapters, then click Next.
6. Select Microsoft as the manufacturer, select Microsoft KM-TEST Loopback Adapter as the adapter for Windows10 , then click Next.
7. Select Next to confirm the installation.
9. Select Finish to complete the installation.

To configure the newly created adapter:

1. Click Start > Control Panel > Network Connections.
2,. Double-Click  the newly created connection, mIne was labeled Ethernet 4

Select the Adapter

4. Right-click on the selected connection and choose Properties from the menu.
5. If it is not, return to step 2 and retry properties for another adapter.
6. Select Internet Protocol IPV4, and click Properties to open Internet Protocol (TCP/IP) Properties.
7. Select Use the following IP address.
8. Fill in the IP address and Subnet mask fields.

Example:, <=====But use the IP address shown by

Loopback Adpatee for Windows 10
9. Click OK to close the Internet Protocol (TCP/IP) Properties.
10. Click OK to close the connection properties.
11. Right click the Microsoft Driver and rename it to just "Loopback". DreamGrid will automatically update the driver if your Public IP changes.

After setting the Loopback Adapter

Method B (etc/hosts) for Windows 8 or 8.1 or 10

Search for Notepad, then right-click on Notepad in the search results list, and choose to run it as administrator. If you’re using Windows 10 this will be on the Start Menu.

Once you’ve done so, open up the following file using the File -> Open feature.


This file has no .txt extension! You will have to change the to All Files *.* pulldown above the file Open button to see it.

Hosts file 

Now enter and then your choice of your domain name separated by a space or a tab character, like this

Editing the hosts file

Now that you have edited your Hosts file make sure to save it. This goes into effect immediately.

Method A (etc/hosts) Windows 7

To access the hosts file in Windows 7 you can use the following command in the Run Line to open notepad and the file.

notepad c:\windows\system32\drivers\etc\hosts


Now enter and then your choice of your domain name separated by a space or a tab character, like this

Editing the hosts file

Now that you have edited your Hosts file make sure to save it.

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