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Chapter 37 Troubleshooting
Nebula Mobile Router User’s Guide
312
I cannot connect to the Zyxel Device using FTP, Telnet, SSH, or Ping.
1Telnet, SSH and Ping) to access the Zyxel Device.
2Check the server Port number field for the web service in the Maintenance > Remote Management
screen. You must use the same port number in order to use that web service for remote management.
3Try the troubleshooting suggestions for I cannot access the Web Configurator login screen. Ignore the
suggestions about your browser.
37.4 Cellular Problems
The SIM card cannot be detected.
1Disconnect the Zyxel Device from the power supply.
2Remove the SIM card from its slot.
3Clean the SIM card slot of any loose debris using compressed air.
4Clean the gold connectors on the SIM card with a clean lint-free cloth.
5Insert the SIM card into its slot and connect the Zyxel Device to the power supply to restart it.
I get an Invalid SIM card alert.
1Make sure you have an active plan with your ISP.
2Make sure that the Zyxel Device is in the coverage area of a cellular network.
I get a weak cellular signal.
1Find the location of your nearest cellular base stations, then install the Zyxel Device towards the direction
of those sites. The nearest site or site with a direct line-of-sight is usually preferred.
Note: It is best to test towards more than one cellular site, as the nearest site / line-of-sight is
not always the best due to the terrain, interference, density of usage, and so on. All of
these factors influence the stability, availability and throughput of the link to the Zyxel
Device.
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