There is a known problem with Yahoo connectivity. We believe it is fixed in 22.214.171.124. Please test and report back. Thanks.www.centerim.org
More action can be seen in their bugzilla.
For Centos/RHEL/ScientificLinux users I have started mantaining a repository:
wget http://dl.nux.ro/rpm/nux-centerim.repo -O /etc/yum.repos.d/nux-centerim.repo(EPEL repo may be required to install some stuff - e.g. gpgme).
PS: Yes, I am aware EPEL includes Centerim, actually my RPM is based on their specfile, but their version is outdated.