If you block port 81 outbound, centos-yumconf-4-4.4.noarch.rpm will cause your yum to stop working for CentOS-4. We were serving mirrorlists on port 81 for our new update system, but since this caused some users problems, we are now serving mirrorlists on both port 80 and 81. centos-yumconf-4-4.5.noarch.rpm has released to change the default configuration to port 80 for mirrorlist retrieval. If your yum is not working you can get centos-yumconf-4-4.5.noarch.rpm here: http://mirror.centos.org/centos/4/updates/i386/RPMS/centos-yumconf-4-4.5.noarch.rpm This is a noarch RPM and should work on any centos-4 version. You can install it after download with this command: rpm -Uvh centos-yumconf-4-4.5.noarch.rpm -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos/attachments/20060216/ce9afbc8/attachment-0004.sig>