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Electronic Theatre Controls Inc

Mosaic Designer 2 Fixture Cloud Connection Issues


When attempting to download a fixture from the cloud in Mosaic Designer, you may see the error "Failed to Connect to the Online Fixture Libraray Server"

Explanation of Issue

This issue can occur on heavily managed networks or when a computer's security software is impeding outbound communications to the web. 


  1. Communication from MD2 to the fixture cloud is done via an ephemeral port on the computer to port 80 in the cloud. You'll need to confirm that nothing blocks this communication path
  2.  Temporarily disable any antivirus or security programs on the PC that may interfere with outbound communications.
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