FYI; SIDN has announced a maintanance window starting on March-16 for 24 hours.
“On 17 March 2010, SIDN is implementing a new version of its domain registration system (DRS). A 24-hour maintenance window is scheduled for migration to the new system, as follows:
Start: Tuesday 16 March 2010, 12.00 hours (CET)
End: Wednesday 17 March 2010, 12.00 hours (CET)
Registrations not possible
Please note that, during the maintenance window, your registrar will not be able to register .nl domain names or update existing registrations.
Registrations and updates will be possible again from noon on 17 March.
Brief interruptions to (Who)Is service
The Is and Whois services – the tools for checking the availability of domain names and looking up details of existing registrations – will remain available during the maintenance window. However, there may be some brief service interruptions. The DNS check service will remain available as usual.
Website updates
When the new registration system is introduced, many of SIDN’s procedures, forms and other documents will be changing as well. Numerous updates will therefore be made to the content of the website during the maintenance window, but the site will remain accessible.”
[https://www.sidn.nl/en/news/news/news/article/registration-of-nl-domain-names-not-possible-16-17-march-2010/]