System hang on Content Server disconnect

[enonod]

Windows 8.1 : Calibre 1.13 64bit : Calibre Companion 3.2.4. (CC) : Device - Asus Transformer T300.
Port in use 8078 due (it seems) to 8080 being in use.
The device is connected WiFi via my BT Homehub, to the PC, which is connected to the Hub via LAN as is the NAS which houses the library itself.

I have used Content Server for the first time on obtaining CC. Therefore I am unable to isolate the culprit.
The set up seems to work well, however, when I disconnect the device the PC hangs with Calibre 'Not Responding'. This does not happen at any other time. No other PC programs or PC desktop shortcuts respond.
I have repeated the exercise after a PC reset and Device restart.

Any assistance would be welcome.

[chaley]

It isn't clear to me what is failing, when.

First, upgrade CC to V3.2.5. V3.2.4 has a problem where sometimes wireless device connections fail.

So, back to your problem. If I understand correctly, there is a computer somewhere on your LAN running calibre. Your library is not on that computer, but is instead on a NAS on your LAN, connected by cable to the computer running calibre. Your Transformer is connected via wifi to an access point that is connected via cable to the computer running calibre.

If this is correct, then the first problem is that calibre specifically does not support putting the library on a NAS. See I am getting errors with my calibre library on a networked drive/NAS? in calibre's FAQ. All sorts of strange things can happen, and what you are seeing might be one of them. Put the library on a hard drive directly connected to the computer running calibre and see if the problem goes away.

If the problem does not go away, then ...

It seems that you are saying that the entire computer running calibre is hanging ("No other PC programs or PC desktop shortcuts respond"). This indicates that the problem is somewhere deep in the OS, because there is (in theory) nothing a user-space program can do to stop the OS. I have no idea what the problem might be.

Some diagnostics:
1) Does the same thing happen when you connect to that content server from a browser on a different computer? From a browser on the same computer?
2) Are there any errors in the content server logs? (use Preferences -> Sharing over the net to see the logs).
3) Does everything appear to work until you disconnect?
4) If you wait for at least 2 minutes, does the computer come back? This is checking to see if the problem is related to system-level TCP network connection closing, which has some timeouts in it of slightly in excess of one minute.

[enonod]

Thank you chaley for your thorough response.
1. I did not notice but CC auto upgraded and is after all 3.2.5.
2. You are correct in your understanding of the set up.

This is an interim response to acknowledge. I now intend to follow your up on your suggestions etc. and will reply later.

[enonod]

I have attempted at least a dozen times in various ways to recreate the problem and have failed to achieve. I can only assume that the CC update happened after my first post (Google Store updates automatically) and that the earlier version was in some way the cause or it was a 'fluke' that coincided. Nothing else has changed.

I do take on board, and am grateful for, your pointer regarding NAS but can see no way that there would be two accesses at the same time from different sources, requiring locking. I will keep that uppermost in my mind in case of future problems.

your 1. unknown.
your 2. No error entries for today.
your 3. The answer was yes.
your 4. the answer would have been no.

Thank you for your time.