I am having a reoccurring issue with my QNAP TS-420U. Basically every couple of days I seem get locked out of the Shared Folders. The shared folders are inaccessible and I get the error message attached when I try to access the Fileshare. In addition I tried to connect to the Web interface of the NAS and got a "502 proxy error" (screenshot has been attached for this issue). I have got the ISCSI volumes configured to the NAS which connect to my Hyper V server. This ISCSI volume hosts the Virtual Hard disk file for my SQL server. Whenever the lockout issue occurs I experience performance issues with the databases that are stored on the VHD file which sits on the ISCSI connection.
I had no choice but to perform a hard reboot of the NAS. However the problem with this is when the NAS is not shutdown properly I get the error message "The Filesystem is not clean". (A screenshot of this error message is found below). I performed a repair on the filesystem last week however this issue has reoccurred.
I have reviewed the system event logs and couldn't locate anything that would have caused this issue.
Any advise would be much appreciated.