I have two linkstation duos (LS-WXL). I was using 1 as the primary and 1 as the backup. The backup was also my time machine backup for my iMac. Recently, however, I've noticed that when trying to backup, time machine trys to mount the backup disk, fails then i can no longer connect to the nas drive through finder although i can connect through the web gui to reboot. I can see the nas in the finder, i just can't login to it as a guest or named user. When I first had this issue I switched the time machine to the primary with exactly the same behaviour...
I'm on firmware 1.63 on both nas devices and 10.8.2 on the imac. Any thoughts?