Server not found

will43 · 05-13-2025, 02:40 PM

I have Calibre, latest version, on Windows 11. Defender Firewall is set to allow Calibre and Google Chrome through. "What is My IP" gives me external IP address. Content Server is launched and shows an internal IP (192.168.x.x) with an 8080 pass through. No amount of trying allows Chrome on a second computer to browse to external IP on home computer at 8080 I've tried endlessly

I simply want to read and highlight on one, and be able to read and see those highlights, and add more on the second. Is this possible?

BTW export and import of Highlights is not supported so that is not a workaround

Thanks!

theducks · 05-13-2025, 02:48 PM

192 is Not routable from the outside.
OTOH I routinely access my main (Library) computer at 10.0.0.21 (comcast uses 10 instead of 192 ).

Another internal blockage is WiFi is set to block Peer-Peer or it may be that the WiFi devices are on other bands. My server is on a Wired part of the LAN so the WiFi peer is not an issue for me

will43 · 05-13-2025, 04:04 PM

Reply to all and self: I semi solved it by setting up a Tailscale personal VPN, which allows remote access to Content server at VPN generated IP address. However, the highlights and bookmarks do not associate. I can highlight and bookmark on each side but they do not appear on the opposite side. Export-Import of highlights does not work either. Still looking for solution to this, as is important for research work

PeterT · 05-13-2025, 05:48 PM

The normal approach is to forward port 8080 on your router to the internal IP address of your PC / port 8080 and then from an external device connect to to port 8080 of your external IP address.

Note that this will only work for true external connections; another PC on your LAN would still connect to the internal IP address and port 8080.

razmichael · 05-19-2025, 10:21 AM

Alternative solution here (and for general access from 'outside'): I'm running my content server on a Pi (along with a media server, NAS and bunch of other things). This will sound a bit like spam but I have used NORDVPN for years for VPN connections (with a paid subscription) but found that they offer a private encrypted private LAN capability called"MeshNet" which allows you to set up a virtual private LAN between multiple devices and IT"S FREE! You do need to have an account but do not need to subscribe to any of the VPN plans. This allows me to have my Pi, PC, Phone, Laptop etc on a private LAN (need to run NordVPN on each with MeshNet enabled), each getting a private IP address (call it static for lack of a better word). Each device is individually configured with a number of options (what is allowed and not allowed). This include being able to route locally, route all traffic through and out the normal LAN (useful for streaming), etc. You can also invite others to join your meshnet with specific options allowed (my kids can access Calibre, the media server etc) - this can be for a single period of time or just kept setup.

In this context (phone as example), I can connect with calibre through my local Pi address when on my LAN or using the MeshNet IP when external. In fact I generally just use the MeshNet IP in the favourites as this keeps things simple - so I almost always connect trough the private LAN from any mobile device.

As noted this can also be handled through various port-forwarding and other network configuration changes but I have seen many people screw this up thinking they are secure (and, yes, you need to assume MeshNet is secure). By using a private LAN it offers a really flexible system for not only this use case but lots more.

in my Calibre service start I use
ExecStart=/opt/calibre/calibre-server --trusted-ips "100.92.1.187,192.168.2.20,100.87.43.42,192.168.2. 60" --enable-local-write "/home/calibre/Calibre_Library"
with the 100. addresses being the MeshNet assigned IPs for my phone and laptop.

I don't normally markup anything but I did just validate adding a highlight into a book from the local side and it showed up on the phone as expected.

I leave it to you to read up on Meshnet to see if it might make things a bit easier.

05-13-2025, 02:40 PM	#1
will43 Junior Member Posts: 2 Karma: 10 Join Date: May 2025 Location: Marin County, CA Device: calibre on pc	Server not found I have Calibre, latest version, on Windows 11. Defender Firewall is set to allow Calibre and Google Chrome through. "What is My IP" gives me external IP address. Content Server is launched and shows an internal IP (192.168.x.x) with an 8080 pass through. No amount of trying allows Chrome on a second computer to browse to external IP on home computer at 8080 I've tried endlessly I simply want to read and highlight on one, and be able to read and see those highlights, and add more on the second. Is this possible? BTW export and import of Highlights is not supported so that is not a workaround Thanks!

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05-13-2025, 02:48 PM	#2
theducks Well trained by Cats Posts: 30,913 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	192 is Not routable from the outside. OTOH I routinely access my main (Library) computer at 10.0.0.21 (comcast uses 10 instead of 192 ). Another internal blockage is WiFi is set to block Peer-Peer or it may be that the WiFi devices are on other bands. My server is on a Wired part of the LAN so the WiFi peer is not an issue for me

05-13-2025, 04:04 PM	#3
will43 Junior Member Posts: 2 Karma: 10 Join Date: May 2025 Location: Marin County, CA Device: calibre on pc	Reply to all and self: I semi solved it by setting up a Tailscale personal VPN, which allows remote access to Content server at VPN generated IP address. However, the highlights and bookmarks do not associate. I can highlight and bookmark on each side but they do not appear on the opposite side. Export-Import of highlights does not work either. Still looking for solution to this, as is important for research work

05-13-2025, 05:48 PM	#4
PeterT Grand Sorcerer Posts: 13,316 Karma: 78876004 Join Date: Nov 2007 Location: Toronto Device: Libra H2O, Libra Colour	The normal approach is to forward port 8080 on your router to the internal IP address of your PC / port 8080 and then from an external device connect to to port 8080 of your external IP address. Note that this will only work for true external connections; another PC on your LAN would still connect to the internal IP address and port 8080.

05-19-2025, 10:21 AM	#5
razmichael Enthusiast Posts: 32 Karma: 106 Join Date: Dec 2010 Location: Ottawa Device: Kobo WiFi	Alternative solution here (and for general access from 'outside'): I'm running my content server on a Pi (along with a media server, NAS and bunch of other things). This will sound a bit like spam but I have used NORDVPN for years for VPN connections (with a paid subscription) but found that they offer a private encrypted private LAN capability called"MeshNet" which allows you to set up a virtual private LAN between multiple devices and IT"S FREE! You do need to have an account but do not need to subscribe to any of the VPN plans. This allows me to have my Pi, PC, Phone, Laptop etc on a private LAN (need to run NordVPN on each with MeshNet enabled), each getting a private IP address (call it static for lack of a better word). Each device is individually configured with a number of options (what is allowed and not allowed). This include being able to route locally, route all traffic through and out the normal LAN (useful for streaming), etc. You can also invite others to join your meshnet with specific options allowed (my kids can access Calibre, the media server etc) - this can be for a single period of time or just kept setup. In this context (phone as example), I can connect with calibre through my local Pi address when on my LAN or using the MeshNet IP when external. In fact I generally just use the MeshNet IP in the favourites as this keeps things simple - so I almost always connect trough the private LAN from any mobile device. As noted this can also be handled through various port-forwarding and other network configuration changes but I have seen many people screw this up thinking they are secure (and, yes, you need to assume MeshNet is secure). By using a private LAN it offers a really flexible system for not only this use case but lots more. in my Calibre service start I use ExecStart=/opt/calibre/calibre-server --trusted-ips "100.92.1.187,192.168.2.20,100.87.43.42,192.168.2. 60" --enable-local-write "/home/calibre/Calibre_Library" with the 100. addresses being the MeshNet assigned IPs for my phone and laptop. I don't normally markup anything but I did just validate adding a highlight into a book from the local side and it showed up on the phone as expected. I leave it to you to read up on Meshnet to see if it might make things a bit easier.