Content Server issues

dchapman · 03-29-2024, 05:58 PM

Good day.

I am new here. Please be gentle.

Calibre 7.7.0 on Windows 11 Insider Preview.

This issue also occurred in earlier versions of Calibre.

Last fall the content server was working pretty well. Not terribly reliable but when it worked it worked well. I could connect from the localhost via a browser, from the LAN and from outside.

However, since early December the content server has not worked. Localhost, LAN, WAN, nothing happens. Port number unchanged. I tried HTTP and HTTPS.

I often get the error message:

------ begin error
calibre, version 7.7.0
ERROR: Unhandled exception: <b>ConnectionResetError</b>:[WinError 10054] An existing connection was forcibly closed by the remote host

calibre 7.7 embedded-python: True
Windows-10-10.0.22631-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22631')
Python 3.11.5
Windows: ('10', '10.0.22631', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre.exe
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 9, 0) && DeDRM (7, 2, 1) && Package KFX (from KFX Input) (2, 9, 0) && Barnes & Noble (1, 5, 3) && Fantastic Fiction (1, 6, 5) && Find Duplicates (1, 10, 9) && Goodreads (1, 8, 0) && Goodreads Sync (1, 16, 5) && KFX metadata reader (from KFX Input) (2, 9, 0) && From KFX (2, 9, 0) && KFX Input (2, 9, 0) && Set KFX metadata (from KFX Output) (2, 7, 0) && KFX Output (2, 7, 0) && Obok DeDRM (7, 2, 1) && Quality Check (1, 13, 10) && ePub Extended Metadata {Writer} (0, 11, 2) && ePub Extended Metadata {Reader} (0, 11, 2) && ePub Extended Metadata (0, 11, 2)
Traceback (most recent call last):
File "calibre\gui2\actions\device.py", line 243, in toggle_content_server
File "calibre\srv\embedded.py", line 145, in stop
File "calibre\srv\loop.py", line 758, in stop
File "calibre\srv\loop.py", line 688, in wakeup
File "calibre\srv\loop.py", line 682, in write_to_control
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
------ end error

At this poiint I have always rebooted the computer as I am guessing this error is a Windows problem.

Any ideas?

Thanks,

David Chapman

Cactus Chef · 03-30-2024, 11:45 AM

Mods might want to move this to the Calibre forum.

kovidgoyal · 03-30-2024, 10:59 PM

This will be caused by a security/antivirus/firewall type program. Add exceptions for calibre.exe to such programs. You can also reboot in safe mode with networking to check.

dchapman · 04-01-2024, 11:26 PM

Thank you for the response.

Would anti-virus or firewall effect a local browser connection? ie.
Connect/share -> Visit Content server in browser?

I did restart in safe mode with network. No change.

I also disabled the firewall and VPN (both Bitdefender). Windows Defender is disabled.

I tried mild swearing. No change.

Any other thoughts?

Thanks again.

kovidgoyal · 04-02-2024, 06:33 AM

antivirus definitely would, it tends to take exception to programs communicating with each other often. In this case the communication is actually between a pair of sockets in the same program (the server's "control" pipe).

From the traceback it looks like the error happens when you are stopping the server. So this shouldnt be critical anyway. Restarting calibre should be enough. No need to restart the computer.

03-29-2024, 05:58 PM	#1
dchapman Junior Member Posts: 2 Karma: 31956 Join Date: Mar 2024 Device: Lenovo Slim 71 Pro x	Content Server issues Good day. I am new here. Please be gentle. Calibre 7.7.0 on Windows 11 Insider Preview. This issue also occurred in earlier versions of Calibre. Last fall the content server was working pretty well. Not terribly reliable but when it worked it worked well. I could connect from the localhost via a browser, from the LAN and from outside. However, since early December the content server has not worked. Localhost, LAN, WAN, nothing happens. Port number unchanged. I tried HTTP and HTTPS. I often get the error message: ------ begin error calibre, version 7.7.0 ERROR: Unhandled exception: <b>ConnectionResetError</b>:[WinError 10054] An existing connection was forcibly closed by the remote host calibre 7.7 embedded-python: True Windows-10-10.0.22631-SP0 Windows ('64bit', 'WindowsPE') ('Windows', '10', '10.0.22631') Python 3.11.5 Windows: ('10', '10.0.22631', 'SP0', 'Multiprocessor Free') Interface language: None EXE path: C:\Program Files\Calibre2\calibre.exe Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 9, 0) && DeDRM (7, 2, 1) && Package KFX (from KFX Input) (2, 9, 0) && Barnes & Noble (1, 5, 3) && Fantastic Fiction (1, 6, 5) && Find Duplicates (1, 10, 9) && Goodreads (1, 8, 0) && Goodreads Sync (1, 16, 5) && KFX metadata reader (from KFX Input) (2, 9, 0) && From KFX (2, 9, 0) && KFX Input (2, 9, 0) && Set KFX metadata (from KFX Output) (2, 7, 0) && KFX Output (2, 7, 0) && Obok DeDRM (7, 2, 1) && Quality Check (1, 13, 10) && ePub Extended Metadata {Writer} (0, 11, 2) && ePub Extended Metadata {Reader} (0, 11, 2) && ePub Extended Metadata (0, 11, 2) Traceback (most recent call last): File "calibre\gui2\actions\device.py", line 243, in toggle_content_server File "calibre\srv\embedded.py", line 145, in stop File "calibre\srv\loop.py", line 758, in stop File "calibre\srv\loop.py", line 688, in wakeup File "calibre\srv\loop.py", line 682, in write_to_control ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host ------ end error At this poiint I have always rebooted the computer as I am guessing this error is a Windows problem. Any ideas? Thanks, David Chapman

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03-30-2024, 11:45 AM	#2
Cactus Chef Addict Posts: 296 Karma: 4504466 Join Date: Apr 2019 Device: Kobo Sage, Kobo Clara HD, Galaxy Tab S5e, Kindle 4th Gen	Mods might want to move this to the Calibre forum.

03-30-2024, 10:59 PM	#3
kovidgoyal creator of calibre Posts: 43,866 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	This will be caused by a security/antivirus/firewall type program. Add exceptions for calibre.exe to such programs. You can also reboot in safe mode with networking to check.

04-01-2024, 11:26 PM	#4
dchapman Junior Member Posts: 2 Karma: 31956 Join Date: Mar 2024 Device: Lenovo Slim 71 Pro x	Thank you for the response. Would anti-virus or firewall effect a local browser connection? ie. Connect/share -> Visit Content server in browser? I did restart in safe mode with network. No change. I also disabled the firewall and VPN (both Bitdefender). Windows Defender is disabled. I tried mild swearing. No change. Any other thoughts? Thanks again.

04-02-2024, 06:33 AM	#5
kovidgoyal creator of calibre Posts: 43,866 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	antivirus definitely would, it tends to take exception to programs communicating with each other often. In this case the communication is actually between a pair of sockets in the same program (the server's "control" pipe). From the traceback it looks like the error happens when you are stopping the server. So this shouldnt be critical anyway. Restarting calibre should be enough. No need to restart the computer.

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