After an upgrade from version 15.1.15.2022 the core server won't start anymore. We get an message that the webservice has an issue starting.
In the PRTG Core Server Log, a message is displayed:
11/04/2017 14:17:40 Ticket ReadHeaders Exception: List does not allow duplicates ($07B3)
11/04/2017 14:17:40 Startup: Problem during startup: List does not allow duplicates ($07B3)
We already tried to replace the config file wich didn't help
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