Below is a list of servers that TLE needs to be able to access in order to operate fully.

For satellite imagery and data from NASA:
- data.worldwind.arc.nasa.gov
- if possible allow all traffic from *.worldwind.arc.nasa.gov (* is a wildcard character and your firewall must be able to support it).  If not possible then:
- www.nasa.network.com
- 21.184.129.98
- *.arc.nasa.gov (* is again a wildcard character and if this cannot be entered using worldwind.arc.nasa.gov and then all servers worldwindNN.arc.nasa.gov where NN are numbers from 20-29 may be sufficient)

For application updates and data search:
- www.thelayeredearth.com
- thelayeredearth.com
- www.layeredearth.com
- layeredearth.com
- update.thelayeredearth.com
- update.layeredearth.com