DNS nameservice interruption for Science domains

Yesterday afternoon a DNS error with science.ru.nl (due to the introduction of the secure DNSSEC) made science.ru.nl disappear from the internet for many users, when viewed from outside campus. In the evening this error has been corrected. Because of the caching of DNS responses, the last problems should disappear tonight. In the meantime one can use workarounds like rebooting the home router and/or pc, using a different network (mobile provider) or using rainloop.science.ru.nl instead of roundcube.science.ru.nl for webmail access.