Yes it's on the web UI, right after I log in, I get redirected to the page That tell me there might be a newer OLED firmware available for my DNS-343 and that I can check for it on the D-Link support page with two link to go there bellow the message I got a box titled: CURRENT OLED FIRMWARE INFO that says my OLED firmware version is 1.04 and my OLED firmware date is 11/24/2010 With only one action available it is a button Start, it's when I click this button that I get the symptom I described before.
The only way I can get out of this page without going through with this verification is by manually typing an URL to an other section of the Web UI.
When I go the the Maintenance / Firmware upgrade section of the Web UI it give me a different version for my OLED firmware (I must assume that the screen I see after log in display the NAS firmware version instead of the OLED one):
Current NAS Firmware Version : 1.04
Current OLED Firmware Version : 1.00.04152008