[arch-general] Key "A6234074498E9CEE" could not be looked up remotely

Hello, I've got a problem with pacman: when I try to upgrade the system pacman writes "key "A6234074498E9CEE" could not be looked up remotely". Then I looked into this forum thread (https://bbs.archlinux.org/viewtopic.php?pid=1501915#p1501915). I tried the workaround but "pacman-key --refresh-keys" returned (after a long time): gpg: Refresh vom Schlüsselserver fehlgeschlagen: Dateiende ==> FEHLER: Ein spezifizierter lokaler Schlüssel konnte nicht vom Schlüssel-Server aktualisiert werden. (it means:) gpg: refresh failed from the key server: end of file ==> ERROR: a specified local key could not be refreshed by the key server. Do you have any solutions? -- Viktor