HomeKurzweil 3000 (K3000)Kurzweil 3000 (General)CLTFSGTFLERR error when opening file from Universal Library

1.59. CLTFSGTFLERR error when opening file from Universal Library

Last Updated: Sept 2019

Applies to: Kurzweil 3000 Web License Subscription


When attempting to open a file from the UL using the Win app, the user receives a CLTFSGTFLERR error similar to the below pictured.

This issue may be encountered when your network is using a proxy server and you have not made the proper exceptions for our service. See below.

What is Light Speed Relay?

It’s a web filter proxy server. You install agents on computers. You access a server console from a website. When a domain user logs into a computer with the agent installed, it applies one or more profiles to that user.


Although they may have allowed our websites (kurzweil3000.com, kurzweiledu.com, fireflybykurzweil.com) in the profiles, they also need to add our websites as exceptions to their HTTPS middle man encryption.

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