Random folder access hanging

Windows Access Rights Management
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qsnappy
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Random folder access hanging

Post by qsnappy »

We recently installed a TVS-672XT, using QTS 5.1.2.2533. The different share folders are mapped to different network drives and a script is used to log into the drives on local login (we dont use domain login). Using Wireshark, I can see that my computer logs into the QNAP fine (and uses the correct username "rfenton"). Seemingly randomly though, when I go to access a network share (or subfolder) in Windows explorer, it'll just hang for a very long time. If I back out and go to a different shared drive/folder, it'll access it fine. Then, when I try and access the original folder, it'll keep hanging for maybe 5 mins or so. All during this time, I can still access any other network share/folder fine. Doesn't seem to be limited to a single share/folder either.

Nobody else is having this problem, so I suspect its something on my computer...

I noticed in Wireshark that it seems to re-send the NTLM authentication again, but this time with no username (guest access to subfolders is denied). I also notice quite a few TCP errors.

I've attached two Wireshark files - the "Start (My PC)" file shows the initial (successful) connection to the share. The "Problem (My PC)" file shows the time around the hanging in Windows explorer starts. You can use the filter ipv6.addr == fe80::265e:beff:fe83:e6a7 && ipv6.addr == fe80::565:1c91:90b9:df1d to filter out communications between my computer (df1d) and the QNAP (e6a7).
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qsnappy
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Re: Random folder access hanging

Post by qsnappy »

Filter:

Code: Select all

ipv6.addr == fe80::265e:beff:fe83:e6a7 && ipv6.addr == fe80::565:1c91:90b9:df1d
oskss
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Re: Random folder access hanging

Post by oskss »

We have a similar setup, and I think we might have the same problem, but on a bigger scale (all accounts doing it).

If you look in access logs, and filter by informational do you see your login once then loads of "guest" attempts?

We have guest disabled, specifically blocked on all shares, and SMB insecure guest turned off on all Windows devices, and we still see a load of guest logins (multiples of 10 or 20 for every genuine account). It's driving me bonkers.
qsnappy
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Re: Random folder access hanging

Post by qsnappy »

I turned off the SMB logging, but when I had it turned on, I noticed I'd login once via SMB, then my computer would attempt again to login as "guest". So probably the same problem as you've got. I don't know if something is triggering the authentication reset? Maybe some broken packets or something?
oskss
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Re: Random folder access hanging

Post by oskss »

We were seeing multiple SMB based errors. After reading your post yesterday I came across the following thread, more than one person posted that reverting to Firmware 5.0.1 solved their issues, so I tried doing this, and all of our problems have gone away. Looks like they've introduced an SMB error in a recent firmware update.

viewtopic.php?p=854909#p854909
qsnappy
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Re: Random folder access hanging

Post by qsnappy »

Unfortunately I've just tried that and its still happening :(
dosborne
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Re: Random folder access hanging

Post by dosborne »

I have experienced a similar issue with my laptop accessing a mapped share on my D-Link NAS, so exact same behaviour, it seems "stuck", but I can access another mapped share on the same device, then eventually I can access the original share. This happens about once a month, so not a big deal. Restarting win explorer often solves it faster. I haven't bothered looking at any logging as it isn't a big deal for me. I sometimes (2 times a year) see this also with my qnap NAS (FW 4.5.4 stream), same problem, same resolution, so attributed it to a client issue rather than a NAS issue.
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