Proliant DL380G5 : no access to Virtual Serial Port (VSP)

[bdx]

Hello,

I have 4 DL380G5 upgraded at the following firmwares :
bios = 2007-05-01a
ilo2 = 1.26

With 2 servers, I succeed to gain access to VSP through an ssh connection to the BMC NIC.

I noticed the following configuration (Remote Console > Settings) :

-----config------
Current serial port configuration

Serial Port Current Setting
UART 1 disabled
UART 2 disabled
iLO 2 Virtual Serial Port COM1 0x3F8 IRQ 4
-----end_config------

With the other 2 servers, I get stuck to Ilo prompt when trying to gain VSP access :

-------begin_trace---------
hpiLO-> vsp

Starting virtual serial port
Press 'ESC (' to return to the CLI Session

hpiLO-> Virtual Serial Port active: IO=0x03F8 INT=4
-------end_of_trace---------

I noticed a slightly different setting (Remote Console > Settings) :

-----config------
Current serial port configuration

Serial Port Current Setting
UART 1 disabled
UART 2 undefined undefined
iLO 2 Virtual Serial Port COM1 0x3F8 IRQ 4
-----end_config------

Well, the only difference I noticed is "undefined" instead of "disabled". Otherwise, all configs are set the same between all the 4 machines. But I'm not sure if it's really relevant for my issue.

Info : I use exclusively Debian 4.0 on these servers.

Does anyone have a clue about that error ?

Thanks in adance !