Let us inform you that on Saturday (March 23, 23:00 p.m.) the zuphux frontend will be shortly unavailable due to a SW upgrade (Debian 6 -> Debian 7). All running proccesses on the frontend will be terminated during the outage.
You can use any of the other frontends during the outage:
https://wiki.metacentrum.cz/wiki/Frontend
With apologies for the inconvenience and with thanks for your understanding.
Ivana Křenková,
MetaCentrum & CREIT-SC