Carlos Santana a écrit : > Thanks Niki. > > More specifically it hangs after: > Downloading Packages: > Running rpm_check_debug > Running Transaction Test > > If I did yum clean all while app. is running then I get following message: > [root at localhost ~]# yum clean all > Existing lock /var/run/yum.pid: another copy is running as pid 17097. In that case, I bet this is your yum-updatesd daemon interfering. Try this: # service yum-updatesd stop And then: # chkconfig yum-updatesd off Basically, you can't have two instances of Yum running at the same time. Up to CentOS 5.2, yum-updatesd defaulted to on, but I understand since 5.3 it defaults to off. Cheers, Niki