FYI - email just received from Skrill Merchant Support [I don't have a Merchant account!]
Dear Merchant,
We will be performing maintenance to the Skrill system on Wednesday 19 April 2017 between 02:30 UTC and 03:00 UTC.
During this time, you and your customers may experience intermittent disruptions when accessing Skrill and its services. These services include logging in to the Skrill website and processing transactions via our API.
Due to the nature of the planned work, please check that your system allows the following Skrill network ranges on your firewalls for your inbound traffic: 91.208.28.0/24 and 193.105.47.0/24.
No change is required regarding your outbound traffic against Skrill public services.
We regret any inconvenience this may cause. Should you have any questions, please contact the Skrill Merchant Support team.
Skrill Merchant Services