Unable to access server GUI

[batyuu]

I have a very similar problem. After upgrading, I get the following message when I try to log in via the web GUI:

“syncthing Login failed, see Syncthing logs for details”

I have tried deleting the password and user from config.xml, after creating a new user and new password again the same phenomenon.

OS Arch linux x86_64, syncthing version: v1.29.0 “Gold Grasshopper”. The server is managed by systemctl, by default it does not write any logfiles, the journal does not show any errors. I have tried running it manually with the option “–logfile=<logfile.log>” added and “–logflags=0” instead of “–logflags=3”, but I still don’t see what the problem is in the log.

[xdias (Alex Dias)]

I opened a new topic but I told to consolidate it here. So, since this week, at least as I’ve checked, I can’t login. In the address below:

http://127.0.0.1:8384/

And after input the login and password, the output is:

Login failed, see Syncthing logs for details.

Even without login in, I’m able to sync the files between my pc host and my android phone.

I’m using Void Linux and to access Syncthing to add and remove device I use the link above.

How can I have access again?

[RalfWW]

@usernamegoeshere

so there was this blue button like area at the top of the 1.28.1 syncthing asking me to upgrade to 1.29.0 via this button. apparently I was logged into the synchting gui normally for this step with the syncthing web user which workes for 1.28.1

so after the speedy update to 1.29.0 the web gui came back up still being inside the anon window of firefox and the user was immedisately logged in. even logging out and re-logging in doesnt bring up the trouble any more.

Seems to me, that the “backgroud-update” from 1.28.1 to 1.29.0 introduce the login problem… But, what is the way to make a downgrade from 1.29.0 to 1.28.1 on a Synology NAS? Thanks Ralf

[imsodin (Simon)]

If you want help, post logs: Browser console logs and/or syncthing logs, the latter optionally with STTRACE=api.

And if you do chime in with “I have the same problem”, please provide OS and browser version - then there’s some useful signal to the comment, maybe there’s a pattern.

[garyez01]

Have the same failure to log into the GUI after upgrading to v1.29.0 from 1.28.1 on the latest Edge browser running on Win11 and latest Firefox running on Linux Mint. Have used SyncTrayzor on Win11 for about one year without issues and can view the 1.29.0 GUI from the Trayzor app but cannot log into it from Edge. Syncthing is running normally and updating the files despite the login failure. Changing the login and password does not fix the problem.

Strangely, in looking at the Syncthing log, it seemed that it was also running on port 54421 and I was able to log into the GUI there with Edge but it wanted me to start a new instance of Syncthing which I didn’t want because all my files are on port 8384.

Console from Edge:

loadFormIntoScope deviceEditor :8384/rest/noauth/auth/password:1

    Failed to load resource: net::ERR_EMPTY_RESPONSE

syncthingController.js:123 Password authentication failed:

1. Object

2. config:

1. data: {username: 'xxxx', password: 'xxxx', stayLoggedIn: undefined}
2. headers: {Accept: 'application/json, text/plain, */*', Content-Type: 'application/json;charset=utf-8'}
3. method: "POST"
4. transformRequest: [ƒ]
5. transformResponse: [ƒ]
6. url: "rest/noauth/auth/password"
7. [[Prototype]]: Object

2. data: null

3. headers: ƒ (name)

4. status: -1

5. statusText: “”

6. [[Prototype]]: Object

7. constructor: ƒ Object()

8. hasOwnProperty: ƒ hasOwnProperty()

9. isPrototypeOf: ƒ isPrototypeOf()

10. propertyIsEnumerable: ƒ propertyIsEnumerable()

11. toLocaleString: ƒ toLocaleString()

12. toString: ƒ toString()

13. valueOf: ƒ valueOf()

14. defineGetter: ƒ defineGetter()

15. defineSetter: ƒ defineSetter()

16. lookupGetter: ƒ lookupGetter()

17. lookupSetter: ƒ lookupSetter()

18. proto: (…)

19. get proto: ƒ proto()

20. set proto: ƒ proto()

Maybe this is enough browser log info to help.

[acolomb (André Colomb)]

Could you please post that again (or edit), but using the code formatting function of the forum? And please do post the Syncthing log you were looking at, since your description of what it said about different ports doesn’t make sense to me.

[garyez01]

Unable to reproduce the port 54421 effect in the logs. The port is now closed. Unable to take a screenshot of the Edge console and because I am new to this forum the code formating function is unknown to me. So I’ll try Firefox on linux next.

[FleurDeLys]

I have similar problem after upgrading to 1.29 I get also the following message when I try to log in via the web GUI on remote machine in same LAN with several browsers (Brave, Chrome, Firefox): “syncthing Login failed, see Syncthing logs for details”

Syncthing running on Raspberry Pi 4, RPiOS Bullseye. Remote machine running on Ubuntu 22.04.3 LTS with Brave Browser [ Version 1.73.104 Chromium: 131.0.6778.204 (Official Build) (64-Bit), Chrome (Version 131.0.6778.204 (Official Build) (64-Bit), Firefox (133.0.3 64bit snap for Ubuntu), same problem with remote machine on ubuntu 24.04 LTS and the same browsers.

I tried all described methods to reset the username and password without result.

I’m not able to find logs because I’m a new linux user