[CentOS] Yum update frozen

Hello,

about one hour ago, I did a "yum update" on a remote centos 4.3
server. It said:

Install      2 Package(s)
Update      60 Package(s)
Remove       0 Package(s)
Total download size: 103 M
Is this ok [y/N]: y

then, after downloading:

Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction

Running Transaction
  Updating  : libgcc                       ##################### [  1/124]
  Updating  : python-urlgrabber            ##################### [  2/124]
  Updating  : hwdata                       ##################### [  3/124]

and so on (note 124 packages, not 62), until it arrived at:


Editing /etc/postfix/master.cf, adding missing entry for tlsmgr service
  Updating  : yum                          ##################### [ 62/124]
  Cleanup   : coreutils                    ##################### [ 63/124]
  Cleanup   : net-tools                    ##################### [ 64/124]
  Cleanup   : tar                          ##################### [ 65/124]
  Cleanup   : postfix                      ##################### [ 66/124]
  Cleanup   : file                         ##################### [ 67/124]
  Cleanup   : grep                         ##################### [ 68/124]
  Cleanup   : newt                         ##################### [ 69/124]
  Cleanup   : python-sqlite                ##################### [ 70/124]
  Cleanup   : rpm-build                    ##################### [ 71/124]
  Cleanup   : mkinitrd                     ##################### [ 72/124]
  Cleanup   : e2fsprogs                    ##################### [ 73/124]

and then nothing more. It has remained stuck at that line for almost one
hour now. Is something funny happening? What should I do? Hit Control-C,
halt the system from another shell (during an upgrade????)?
or should I simply ignore it?

I have no problem to reinstall/reconfigure something if need be. I'm just
worried to lose any contact with the server if I do the wrong thing
during an apparently frozen update.

TIA,
	Marco