Just moved my Untangle gateway from a Dell PE1650 to a Dell PE R200. Both running 9.4. I restored the settings from the 1650, logged into the R200 without issue, received a message "Unable to start download, please contact Untangle support" when attempting to install ANY applications.
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Edit: On the fourth, yes fourth, reboot, UT started downloading applications but now I'm receiving "Unknown internal server error" and the downloads just keep "downloading".