Trouble with new Domain - FC storage (Error code: 5022)

Hi.

I tried to add a new storage domain on RHEVM.

The storage is FC type.

I can see the LUNs but after I checked in, and I submit

the browser after few minutes waiting just display it the following error code:

Network error during communication with Host.  (Error code: 5022)

I checked the error counters on Hypervisor and Virtual Manager Server, both on psychical and bridge interfaces, but I didn't found anything.

 RX packets:147406 errors:0 dropped:0 overruns:0 frame:0
 TX packets:48240 errors:0 dropped:0 overruns:0 carrier:0

There is an 1Gb/s full duplex between the Virtual Manager Server and the Hypervisor, and they can communicate without any problem with each other.

What can be the problem ?