As the title says, if the CD/DVD device of your VM is stuck in connecting mode, one thing to try is to shutdown the vSphere client, and restarted it.
I found this solution from http://communities.vmware.com/message/1784438, and it worked for me.
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For me, I right-click the VM vSphere Client and run it as Administrator and it worked for me.
I suppose that should work too. In my case, I don’t have admin privilege in my work environment.