Dear Sirs, on Wednesday May 4, 2022 from 00:01 AM to 2:00 AM (the timing will be in the zone CEST - Central European Summer Time) the domain management system will be shut down - at this time the system will be temporarily unavailable. At this time, there will not be available information associated with the registry in the Intranet - credit status, list of invoices and expired domains of registrars. Furthermore,some web presentations, the EPP system, web/unix WHOIS and RDAP; displaying a list of registrars; establishing requests for authinfo, blocking and unblocking; mojeID profile editor; interface for creating mojeID accounts and login into the domain browser will not work as well. Furthermore, login into the mojeID service will not work during the first 15 minutes of the shutdown. The main reason of the service shutdown is the upgrade of the application server. I would also like to point out two minor maintenance jobs: On Wednesday April 27, 2022 after 10:00 PM we will upgrade the server mainly with web applications, which will result in their shutdown for a few seconds. This concerns a) most of the association's websites, for example: - www.nic.cz including web WHOIS or creating requests for authinfo, blocking, unblocking; - mojeID profile editor, interface for creating mojeID and login into the domain browser; - intranet; b) other applications, such as: - unix WHOIS and RDAP 2) In the following days we will exchange the SSL certificate for EPP. This maintenance should have no operational impacts. Thank you and kind regards Markéta Kušičková -- Markéta Kušičková CZ.NIC, z.s.p.o. Milešovská 5 130 00 Praha 3 M +420 603 826 732