Setting up in a LAN with Internet granted to one machine only

Support
1

Hello,

I try to run Syncting on a Win10 computer. A gateway prevents it to reach the net. I want to sync with a Win7 computer on the same LAN, which has Internet access.

On the Win7 machine, it runs fine. Unfortunately on the Win10 machine, the system daemon quits before I can do anything.

Here are the logs:

[monitor] 12:38:54 INFO: Log output saved to file "C:\Users\Myself\AppData\Local\Syncthing\syncthing.log" [start] 12:38:55 INFO: syncthing v1.18.1 "Fermium Flea" (go1.16.6 windows-amd64) teamcity@build.syncthing.net 2021-07-30 12:41:57 UTC [start] 12:38:56 INFO: Couldn't fetch release information: Get "https://upgrades.syncthing.net/meta.json": dial tcp: lookup upgrades.syncthing.net: getaddrinfow: The requested name is valid, but no data of the requested type was found. [start] 12:38:56 INFO: Initial automatic upgrade: no version to select [PUSHH] 12:38:56 INFO: My ID: PUSHTAH [PUSHH] 12:38:57 INFO: Single thread SHA256 performance is 75 MB/s using crypto/sha256 (74 MB/s using minio/sha256-simd). [PUSHH] 12:38:57 INFO: Hashing performance is 68.25 MB/s [PUSHH] 12:38:57 INFO: Overall send rate is unlimited, receive rate is unlimited [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting [PUSHH] 12:38:57 INFO: Using discovery mechanism: IPv4 local broadcast discovery on port 21027 [PUSHH] 12:38:57 INFO: Using discovery mechanism: IPv6 local multicast discovery on address [ff12::8384]:21027 [PUSHH] 12:38:57 INFO: TCP listener ([::]:22000) starting [PUSHH] 12:38:57 INFO: QUIC listener ([::]:22000) starting [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down [PUSHH] 12:38:57 INFO: listenerSupervisor@dynamic+https://relays.syncthing.net/endpoint: service dynamic+https://relays.syncthing.net/endpoint failed: Get "https://relays.syncthing.net/endpoint": dial tcp: lookup relays.syncthing.net: getaddrinfow: The requested name is valid, but no data of the requested type was found. [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down [PUSHH] 12:38:57 INFO: listenerSupervisor@dynamic+https://relays.syncthing.net/endpoint: service dynamic+https://relays.syncthing.net/endpoint failed: Get "https://relays.syncthing.net/endpoint": dial tcp: lookup relays.syncthing.net: getaddrinfow: The requested name is valid, but no data of the requested type was found. [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting [PUSHH] 12:38:57 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down [PUSHH] 12:38:57 INFO: listenerSupervisor@dynamic+https://relays.syncthing.net/endpoint: service dynamic+https://relays.syncthing.net/endpoint failed: Get "https://relays.syncthing.net/endpoint": dial tcp: lookup relays.syncthing.net: getaddrinfow: The requested name is valid, but no data of the requested type was found. [PUSHH] 12:38:57 WARNING: Failed starting API: listen tcp: lookup localhost: getaddrinfow: The requested name is valid, but no data of the requested type was found. [PUSHH] 12:38:57 INFO: QUIC listener ([::]:22000) shutting down [PUSHH] 12:38:57 INFO: Detected 0 NAT services [PUSHH] 12:38:57 WARNING: Starting API/GUI: listen tcp: lookup localhost: getaddrinfow: The requested name is valid, but no data of the requested type was found. [PUSHH] 12:38:57 INFO: UPnP parse: dial tcp 192.168.1.1:1900: operation was canceled [PUSHH] 12:38:58 INFO: TCP listener ([::]:22000) shutting down [PUSHH] 12:38:58 INFO: Exiting

Thanks for you help.

2

It’s exiting because it can’t start the GUI/API, because “localhost” is apparently not a thing on this computer. That said, our default listen address is 127.0.0.1:8384 which doesn’t require looking up localhost, so I guess something is non-default here, or maybe the Go HTTP server wants to look up localhost for some other reason. In any case, not having a localhost is unusual and I’m not surprised it breaks. Perhaps you need to be less strict in what “not granted internet” means.

4

I looked in large and long and I don’t know where to ask. What I find on forums is about installing IIS.

Indeed, localhost doesn’t exist on that computer. I don’t know why. I even tried to edit the hosts file despite it’s written there it should be managed by the DNS.

With ping localhost I get this error message: Ping request could not find host localhost. Please check the name and try again. But I get a reply from 192.168.0.1 after adding gateway in the file.

And as the gateway relays DNS queries, I can resolve something like www.syncthing.net to 34.159.25.198, even if my packets aren’t going to the Web.

Writing this, I realize I’m using SyncTrayzor but I’ve not tried to run syncthing in the CLI only. I’ll try that soon.

5

Could you try this?

2 Likes
6

I realised Edge is removed/disabled in that machine. I managed to get Firefox from the admin. Also I edited manually SyncTrayzor’s config file to use 127.0.0.1 instead of localhost. SyncTrayzor’s problem seemed solved but syncthing was still holding like “waiting for something” without showing any error, either started from the CLI or from SyncTrayzor.

Then I saw your post and tried ipconfig /flushdns, rebooted and… It worked !

Thanks a lot !

8

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