Unable to synchronize Kobo Aura HD with Calibre-Web

[pippobimbo]

Describe the bug/problem
Unable to synchronize Kobo Aura HD with Calibre-Web.

To Reproduce
Steps to reproduce the behavior:

1. Install Calibre-Web container provided by LinuxServer into Docker on Synology NAS
2. Calibre-Web container can be accessed locally on port 8083. I'm also using Synology reverse proxy which redirects https://calibre.mydomain.fr on http://192.168.0.xx:8083
3. In Calibre-Web options, I checked "Enable Kobo Sync" and "Proxy unknown requests to Kobo Store"
4. Copy Kobo Sync Token in profile
5. On Kobo Aura HD, I edited eReader.conf file as following (With token from previous step): https://calibre.mydomain.fr/kobo/{token}
6. Restart both Calibre-Web and Kobo Aura HD device
7. Hit "Sync now" button on Kobo. Device is "checking for updates" and displays following error "Sync failed. Pease check your Wi Fi and try again."

Logfile

calibre-web.log:

[2020-05-23 15:42:41,196] INFO {cps:95} Starting Calibre Web...
[2020-05-23 15:42:41,688] INFO {cps.server:140} Starting Gevent server on [::]:8083
[2020-05-23 15:48:33,242] INFO {cps.kobo:905} Init
[2020-05-23 15:48:33,595] DEBUG {cps.kobo:920} Kobo: Received unproxied request, changed request port to server port
[2020-05-23 15:48:33,783] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/user/profile
[2020-05-23 15:48:34,666] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/user/loyalty/benefits
[2020-05-23 15:48:34,875] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/analytics/gettests
[2020-05-23 15:48:35,492] INFO {cps.kobo:132} Kobo library sync request received.
[2020-05-23 15:48:35,492] DEBUG {cps.kobo:134} Kobo: Received unproxied request, changed request port to server port
[2020-05-23 15:50:32,407] INFO {cps.kobo:905} Init
[2020-05-23 15:50:32,873] DEBUG {cps.kobo:920} Kobo: Received unproxied request, changed request port to server port
[2020-05-23 15:50:33,027] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/user/profile
[2020-05-23 15:50:33,903] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/user/loyalty/benefits
[2020-05-23 15:50:34,179] DEBUG {cps.kobo:843} Unimplemented User Request received: http://calibre.mydomain.fr/kobo/{token}/v1/analytics/gettests
[2020-05-23 15:50:35,328] INFO {cps.kobo:132} Kobo library sync request received.
[2020-05-23 15:50:35,330] DEBUG {cps.kobo:134} Kobo: Received unproxied request, changed request port to server port

Expected behavior
I'm expecting for my calibre library appear on my kobo device.

Environment

• HP Proliant N40L 5 HDD NAS with XPenology DSM 6.2-23739 and Docker package v18.09.0-513
• Docker container : LinuxServer/Calibre-Web
• Calibre-Web version : 0.6.8 Beta - 087c4c5 - 2020-05-23T08:48:08+02:00
• Python version : 3.6.9 (default, Apr 18 2020, 01:56:04) [GCC 8.4.0]
• WebServer : Gevent 1.5.0
• Kobo Aura HD firmware 4.21.1505

Additional context
Hello. I'm using Calibre-Web for a year now and this is a fantastic application. Thanks for your work. So, I'm trying to use Kobo Sync with no luck.

Just a little thing : my library contains 2500 books. May be, it does matter.

[OzzieIsaacs]

Form the logfiles it looks good.
Maybe you are suffering from this one: #1276

[pippobimbo]

Thank you @OzzieIsaacs
You're right. I tried with a little library (200 books) and it works great.

Thank you for your work.