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After installing Remote Desktop Services recently for a client we found the portal wouldn't start correctly and we were presented with error 500.19. The solution was to do the following courtesy of [https://forums.iis.net/t/1149768.aspx](http://forums.iis.net/t/1149768.aspx)

- Take IIS backup.
- Open IIS
- Click on server module node at the top of the left hand tree and choose "Modules".
- Right click on DynamicCompressionModule and choose "Unlock"
- Right click on StaticCompressionModule and choose "Unlock".
- Open desired websites -> Open Modules.
- Right click on DynamicCompressionModules and choose "remove".
- Right click on StaticCompressionModule and choose "Remove".
- Do IISRESET.

Once complete the RDS portal worked like a charm.