Su una distribuzione pulita di CentOS 5.4 x86_64, in fase di installazione di Plesk 9.3, puo’ capitare questo errore:

Determining the packages that need to be installed.
Unhappy catched; try to resolve again.
The requested package “psa” could not be installed.
Searching problems for the “psa” package.
No suitable solutions were found for the “bind >= 9.2.1″ dependency.
The “bind-30:9.3.4-10.P1.el5_3.3.x86_64″ package resolves “bind >= 9.2.1″.
Could not add package bind-libs-30:9.3.6-4.P1.el5.x86_64to the list of required packages.Problem occured during searching directly resolved dependencies for ‘libbind9.so.0()(64bit)’ of package bind-30:9.3.4-10.P1.el5_3.3.x86_64 ERROR: Unable to install the “psa-9.2.3-cos5.build92091016.19.x86_64″ package.
Not all packages were installed.
Please, contact product technical support.

Per risolverlo basta installare:

yum install cyrus-sasl-md5 db4-utils bind

Subito dopo puliamo la cache di yum:

yum clean all

E facciamo ripartire l’installazione