If your problem appears after some time with a known working configuration, you can jump directly to the System known to be working section.

Otherwise, you can consult the following Fresh installation or reconfiguration section.

Fresh installation or reconfigurationLink to Fresh installation or reconfiguration

Network configurationLink to Network configuration

The first thing to verify is that your gateway is able to communicate with the server, from an IP point of view.You can find more information regarding the network configuring here.

The ping command can be used to verify you have access. 
The most simple is to try first to reach the router on which the LORIX One is connected. In case of success and if you need to access the outside world, try with an external server.
For example, the command ping 8.8.8.8 can be used to verify you can reach the DNS servers of Google.

Another point to check is that your firewall is accepting output connections. Otherwise, the gateway will obviously not be able to communicate with external servers.

Server configurationLink to Server configuration

Once you've validated that your network configuration is fine in the previous section, you need to ensure the forwarder is correctly configured to reach the network server, being hosted in the cloud or in your own network.

The LORIX OS user's guide explains in detail how to configure it with the most common servers and clouds in the dedicated section.

System known to be workingLink to System known to be working

You successfully configured your gateway including the network aspect as well as the connection to your server.
After some time of running however, you can't to reach your gateway, it's not detected by the server or simply you don't receive packets from nodes.

No more access using SSHLink to No more access using SSH

When you have the trouble, is the gateway not accessible anymore through the SSH and you need to switch power off and on to get it back ?
In this case, the page regarding a bug in the Linux's ethernet driver can probably helps you.

The gateway is not connected to the serverLink to The gateway is not connected to the server

You can still reach the gateway using SSH but it's not detected anymore by the server.

You have may be a temporary network issue or the server is down.
Please verify the gateway can still reach the server and the Internet, also take a look at the forwarder logs that you can find in the LoRa Settings page of the web interface to see if something seems wrong: