Suddenly unable to login via console

I restarted my guest that's been running fine for a few days, and suddenly I am unable to login thru the java browser-based console thru the VM Manager.
Everything about the console looks fine: It shows me all the usual startup messages if I open it while the VM guest is booting, it prompts me for the login username and password but instantly returns to the "TestVMHost login:" prompt after entering the correct password. It does this for all three plain users and root that I have established in this VM guest.
I can SSH into the VM guest just fine with PuTTY over the network and login with any valid username/password, so I am not locked out of access to the VM guest. It's just the java-browser console app itself that suddenly stopped letting me login.
Any ideas?
PS: the VM server is 2.2 and the guest is OEL 5.4 installed from media, not from a pre-built template, both are 64-bits.

Hi, I have no idea of what can be the reason for your sudden console blackout...
What I can say is that here on my side, SUDDENLY, after a few random reboots (and without touching anything else!), I'm not experiencing the system-console error messages flood anymore (pls see my last post, sorry I'm a bit in a hurry and I'm not able to put in the link).
I have a different error now, just one, after that it looks like it started to function "by itself".
I'm starting to think OVM 2.2 has major problems with networking, and I have the feeling they are related to the new bridge "xenbr0:0" that has been probably created for putting one more layer of abstraction regarding the Server Pool Master (has it been designed like this to make possible automatic migration of VM Guests that used to be running on a failed Server Pool Master? Who knows... On 2.1.5, in that scenario, HA wouldn't have been of help, and no automatic restore of any VM Guest would have happened).
What I can say after a few days of tests is I dont' trust this system, thinking to steadily go back to 2.1.5...
I'm maybe doing something wrong too, but this is the feeling. I have also several more minor issues too. Uhm.

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