When you update RedHat automatically by means of up2date, apt-get, yum or other RPM updaters, you must beforehand exclude some packages installed with H-Sphere from the update list:

• rh-postgres, postgresql, postgresql-server, postgresql-libs on CP and user postgresql boxes;
• apache and apache-related packages on H-Sphere CP, WEB and MAIL boxes;
• rsync on all H-Sphere boxes.
• gettext on all H-Sphere boxes.
• proftpd and related packages on H-Sphere WEB boxes;
• qmail, vpopmail, ezmlm and related packages on H-sphere MAIL boxes.
• bind and related packages on H-Sphere DNS boxes.
• aspell/ispell/pspell on CP.
• XFree86 packages on CP: XFree86-base-fonts, XFree86-font-utils, XFree86-libs, XFree86-libs-data, XFree86-xfs, XFree86-Xvfb. This is critical particularly for SiteStudio.

Please note that these packages are also to be removed while preparing servers to H-Sphere installation.

If you have accidentally upgraded your RedHat without excluding these packages, you need to downgrade bind and downgrade PostgreSQL.