All right, thanks for the workaround Mijzelf!

I was having trouble updating the packages list and noticed from zypkg.log that it’s trying to download ftp://ftp2.zyxel.com/NAS540/zypkg/5.02/ZYPKG_INFO.tgz, whereas the actual file on the server (from a few days ago) is ftp://ftp2.zyxel.com/NAS540/zypkg/5.02/ZYPKG_INFO.TGZ (notice the all-caps .TGZ extension). Can anyone corroborate this is a server-end problem and not just something I’ve managed to break on my end?

2015-08-07 06:00:05 [ipkg][][29288]: [ipkg_op][676] ******** ipkg start as " /usr/bin/ipkg-cl -f /etc/zyxel/pkg_conf/zypkg_conf/zy-pkg.conf -t /i-data/.system/zy-pkgs/tmp download DefaultWebSite ZYPKG_INFO.tgz "
2015-08-07 06:00:05 [ipkg][download][29288]: [ipkg_op][699] cmd_name: download, argv[6]: DefaultWebSite
2015-08-07 06:00:05 [ipkg][download][29288]: [zypkg_set_web_site][2110] ---> using "/etc/package_src_url" (for white box version)
2015-08-07 06:00:05 [ipkg][download][29288]: [zypkg_set_web_site][2124] web site: "ftp://ftp2.zyxel.com/NAS540/zypkg/5.02"
2015-08-07 06:00:05 [ipkg][download][29288]: [ipkg_op][749] @@@ strURL: DefaultWebSite @@@
2015-08-07 06:00:05 [ipkg][download][29288]: start [zypkg_download] with [ftp://ftp2.zyxel.com/NAS540/zypkg/5.02]-[ZYPKG_INFO.tgz]-[/tmp/ZYPKG_INFO.tgz]-[zypkglist]
2015-08-07 06:00:05 [ipkg][download][29288]: [zypkg_download][366] resumeFrom: "0".
2015-08-07 06:00:05 [ipkg][download][29288]: [zypkg_download] strDownloadFile: ftp://ftp2.zyxel.com/NAS540/zypkg/5.02/ZYPKG_INFO.tgz
2015-08-07 06:00:05 [ipkg][download][29288]: [zypkg_download] Start to download zypkglist
2015-08-07 08:00:06 [7]: [zysh_zypkgs_updatelist_showProgress][1415] "/tmp/zypkglist_download.ongoing" exists now.
2015-08-07 08:00:07 [7]: [zysh_zypkgs_updatelist_showProgress][1415] "/tmp/zypkglist_download.ongoing" exists now.
2015-08-07 08:00:08 [7]: [zysh_zypkgs_updatelist_showProgress][1415] "/tmp/zypkglist_download.ongoing" exists now.
2015-08-07 06:00:09 [ipkg][download][29288]: [zypkg_download] ********* curl_result: 78
2015-08-07 06:00:09 [ipkg][download][29288]: [zypkg_download] ********* [??] curl_result: 78
2015-08-07 06:00:09 [ipkg][download][29288]: [zypkg_download] Download zypkglist TIMEOUT
2015-08-07 06:00:09 [ipkg][download][29288]: [ipkg_op][785] download result: 78
2015-08-07 08:00:09 [7]: [zysh_zypkgs_updatelist_showProgress][1415] "/tmp/zypkglist_download.ongoing" exists now.