Update 19/9: All EPP-related issues should now be sorted out and all should be working like normal again.
According to Ficora: "Root cause for EPP issues has been identified. EPP will be normally available on late Sunday 2016-09-18".
Most of .FI request will be put on hold until the issue is solved by the .FI registry.
This means that registrations, updates and requests until Sunday will not be processed and errors may occur during this time.