Occasionally OTA's have unplanned outages where their servers are unable to process updates that we send them.
If you see an error on the dashboard or in an email that has a code 500, 501, 502, 503 OR mentions 'Internal Server/System Error' please DO NOT keep attempting to manually resynchronise your availability. It won't work, and in fact could slow down updates to other OTA's who are not experiencing problems.
If you desperately need to close out Expedia, it is possible to manually close a date, or date range, from within the Expedia Extranet. Booking.com does not support updating from any source other than the channel manager, so in this case you would just have to wait until their issue is resolved.
Once the system is no longer reporting errors when a new booking has been entered for example, you should then go to Settings > OTA connections. Click the link for the affected connection, and then click to Sync Availability from this screen to push the corrected snapshot of your inventory.