Recent appearance of Connection Error message

Support
1

We have been running a three-site, remote RAID system for resilience. All has gone well for some time, but I am now experiencing:

Connection Error: syncthing is unable to process your request at present, please refresh this page or restart syncthing if the problem persists.

(Forgive me if this isn’t word perfect - I write from memory).

At the same time, the remote sites are reported as being disconnected when I have every reason to believe that they are online.

One other site reports similar problems - I am not currently able to speak with the admin of the other to check.

I was getting this for some time prior to upgrading to v0.13.5, Linux (ARM) but it has persisted.

Any suggestions, please?

Many thanks,

Ben

2

Check the logs.

3

I’d be delighted to check the logs, and admit it should have occurred to me - but which, and where are they, please?

I admit to not being a trained systems administrator, so searched the documentation for ‘log’, but to no avail.

Sorry to waste everyone’s time with a trivial question!

Ben

4

It logs to stdout by default, so if you use some magic to autostart it, check what the magic does with the logs

5

Many thanks. Have now restarted and waited for:

Connection error: Syncthing seems to be experiencing a problem processing your request. Please refresh the page or restart Syncthing if the problem persists.

The log - sorry about lack of formatting - reads as follows:

pi@somerset ~ $ more syncthinglog 
[44PAD] 08:23:08 INFO: syncthing v0.13.5 "Copper Cockroach" (go1.6.2 linux-arm) unknown-user@lx-buildslav
e.syncthing.net 2016-06-03 11:03:24 UTC
[44PAD] 08:23:08 INFO: My ID: 44PAD5N-HLZU542-6WNWU5V-7BFKQTP-JWDRRMB-XIIUFDS-5YWWHWY-K5T43QI
[44PAD] 08:23:09 INFO: Single thread hash performance is ~1.9 MB/s
[44PAD] 08:24:29 INFO: Ready to synchronize Music (readonly)
[44PAD] 08:25:34 INFO: Ready to synchronize bfphome (readwrite)
[44PAD] 08:25:35 INFO: Ready to synchronize camerauploads (readwrite)
[44PAD] 08:25:35 INFO: Ready to synchronize gilwern (readwrite)
[44PAD] 08:25:35 INFO: Ready to synchronize syncthing (readwrite)
[44PAD] 08:33:29 INFO: Ready to synchronize wells (readonly)
[44PAD] 08:33:29 WARNING: Stopping folder "bfphome" - folder path missing
[44PAD] 08:33:29 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:33:29 INFO: Using discovery server https://discovery-v4-1.syncthing.net/v2/?id=SR7AARM-TCBUZ5O
-VFAXY4D-CECGSDE-3Q6IZ4G-XG7AH75-OBIXJQV-QJ6NLQA
[44PAD] 08:33:29 INFO: Using discovery server https://discovery-v4-2.syncthing.net/v2/?id=DVU36WY-H3LVZHW
-E6LLFRE-YAFN5EL-HILWRYP-OC2M47J-Z4PE62Y-ADIBDQC
[44PAD] 08:33:29 INFO: Using discovery server https://discovery-v4-3.syncthing.net/v2/?id=VK6HNJ3-VVMM66S
-HRVWSCR-IXEHL2H-U4AQ4MW-UCPQBWX-J2L2UBK-NVZRDQZ
[44PAD] 08:33:29 INFO: Using discovery server https://discovery-v6-1.syncthing.net/v2/?id=SR7AARM-TCBUZ5O
-VFAXY4D-CECGSDE-3Q6IZ4G-XG7AH75-OBIXJQV-QJ6NLQA
[44PAD] 08:33:29 INFO: Using discovery server https://discovery-v6-2.syncthing.net/v2/?id=DVU36WY-H3LVZHW
-E6LLFRE-YAFN5EL-HILWRYP-OC2M47J-Z4PE62Y-ADIBDQC
[44PAD] 08:33:29 INFO: TCP listener (0.0.0.0:22000) starting
[44PAD] 08:33:29 INFO: Completed initial scan (rw) of folder syncthing
[44PAD] 08:33:30 INFO: Completed initial scan (rw) of folder gilwern
[44PAD] 08:33:31 INFO: Completed initial scan (rw) of folder camerauploads
[44PAD] 08:33:40 INFO: Using discovery server https://discovery-v6-3.syncthing.net/v2/?id=VK6HNJ3-VVMM66S
-HRVWSCR-IXEHL2H-U4AQ4MW-UCPQBWX-J2L2UBK-NVZRDQZ
[44PAD] 08:33:44 INFO: Detected 1 NAT device
[44PAD] 08:33:52 INFO: Device EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-WC5OYSH-V3DJ2QP is "kent" a
t [dynamic]
[44PAD] 08:33:52 INFO: Device MYCILLT-Q6ZH63M-LZ3OQSM-HESHXHW-I57KIDL-JQGYM6V-XEZS3YQ-SCYSUQE is "monmout
hshire" at [dynamic]
[44PAD] 08:33:52 INFO: Device UQQO2H4-TDCUZZN-FHBTH64-PGLACFC-BTLKUUX-4UGMIJH-UQOMHOF-ZS22PQ3 is "hudl" a
t [dynamic]
[44PAD] 08:33:52 INFO: Device 44PAD5N-HLZU542-6WNWU5V-7BFKQTP-JWDRRMB-XIIUFDS-5YWWHWY-K5T43QI is "somerse
t" at [dynamic]
[44PAD] 08:33:52 INFO: Starting usage reporting
[44PAD] 08:33:54 INFO: GUI and API listening on 0.0.0.0:8384
[44PAD] 08:33:54 INFO: Access the GUI via the following URL: https://127.0.0.1:8384/
[44PAD] 08:33:56 INFO: Joined relay relay://163.172.210.72:22067
[44PAD] 08:34:17 INFO: Completed initial scan (ro) of folder Music
[44PAD] 08:34:30 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:35:37 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:36:40 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:37:32 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:38:18 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:39:30 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:40:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:41:41 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:42:27 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:43:18 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:44:29 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:45:41 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:46:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:47:26 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:48:23 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:49:19 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:50:24 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:51:32 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:52:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:53:40 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:54:54 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:55:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:56:56 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:57:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:58:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 08:59:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:00:19 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:01:27 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:02:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:03:55 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:04:45 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:07:20 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:08:16 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:09:31 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:10:43 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:11:31 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:12:21 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:13:08 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:14:18 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:14:52 INFO: Completed initial scan (ro) of folder wells
[44PAD] 09:15:21 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:16:25 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:17:31 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:18:43 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:19:30 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:20:17 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:21:22 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:22:15 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:23:06 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:24:05 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:24:50 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:25:57 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:27:09 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:28:21 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:29:35 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:30:27 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:31:31 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:32:16 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:33:24 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:34:25 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:35:27 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:36:31 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:37:26 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:38:39 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:39:29 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:40:18 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:41:10 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:42:24 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:43:35 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:44:49 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:45:35 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:46:29 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:47:14 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:48:16 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:49:03 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:50:07 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:51:20 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:52:14 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:53:09 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:53:58 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:55:11 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:56:04 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:56:51 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:57:47 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:58:46 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 09:59:56 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:00:42 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:01:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:02:45 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:03:57 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:05:04 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:06:13 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:07:24 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:08:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:09:20 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:10:13 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:11:07 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:12:15 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:13:14 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:13:39 INFO: Established secure connection to EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-W
C5OYSH-V3DJ2QP at 192.168.1.200:57061-163.172.210.72:22067 (Relay (Server))
[44PAD] 10:13:39 INFO: Device EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-WC5OYSH-V3DJ2QP client is "
syncthing v0.13.5" named "kent"
[44PAD] 10:14:02 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:15:08 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:16:01 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:16:57 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:17:54 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:18:40 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:19:39 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:20:28 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:21:34 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:22:20 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:23:28 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:24:14 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:25:02 INFO: Connection to EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-WC5OYSH-V3DJ2QP clos
ed: write tcp 192.168.1.200:57061->163.172.210.72:22067: write: connection reset by peer
[44PAD] 10:29:56 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:30:20 INFO: Established secure connection to EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-W
C5OYSH-V3DJ2QP at 192.168.1.200:57695-212.47.241.21:22067 (Relay (Client))
[44PAD] 10:30:20 INFO: Device EYK2MP7-AHYSP56-IT32XC5-LK266QJ-2TGXMBH-ZGHN26O-WC5OYSH-V3DJ2QP client is "
syncthing v0.13.5" named "kent"
[44PAD] 10:30:45 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:31:57 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:32:51 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:33:56 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:34:54 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:35:53 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:36:55 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:37:54 INFO: Skipping folder bfphome scan due to folder error: folder path missing
[44PAD] 10:39:04 INFO: Skipping folder bfphome scan due to folder error: folder path missing
pi@somerset ~ $ ^C
pi@somerset ~ $

I can refresh the web interface page which shows (eventually) that some folders are up to date but that both remote sites are disconnected.

Many thanks,

Ben

6

Well there are other errors which you might want to address, but there is nothing obvious related to the browser.

Check the browser developer tools network tab to see for any requests that return an error http code.

The devices being disconnected are potentially due to a timeout. Check the other sides logs for clues, but I suspect that your device is just too weak to keep up with crypto involved and seems to timeout every now and then. 1.9MB/s hashing performance is of equivalent of a modern calculator.

7

That helps, thanks.

The hardware is a Raspberry Pi 2 running syncthing and a SAMBA client - obviously too much for it. I need to think again, I guess.

Ben

8

Smells like it could be this?

9

There are no errors in the log, and I don’t see the user mentioning he was toggling anything (yet my reading is selective).

10

No, sir, no toggling to my knowledge.

My most recent config change was to set an admin login and p/w, even though the servers are all on private local networks and using the wider internet only for sync purposes, to the best of my belief.

I had understood when setting this up that a Raspberry Pi ought to have sufficient power for this task but seem to have been mistaken.

I’d better give my friends their money back!

Many thanks,

Ben

11

Can anyone tell me whether the pop-up message concerning ‘Communication error: …’ is a sign that the web interface is having trouble or whether communication with peers is at risk?

The former we can live with - the latter means my solution is faulty and needs replacement.

Many thanks for all help,

Ben

12

It is specifically that the web UI is unable to talk to Syncthing, for some reason (or rather, was unable to talk to Syncthing at some point in time: the error does not reset, even if communication with Syncthing is restored).

It has nothing to do with whether Syncthing can talk to other devices.

It would be really good to see a screenshot of the “Network” tab of the developer console in your browser, at the point that this occurs.

13

Thanks for that - at least we have working service!

I’d be more than happy to provide such a screen-shot but don’t know how to reach the page you mention - if you can explain, I shall do my best.

Ben

14

Developer Tools are mostly accessed by hitting the F12 key. Then there should be e network tab which lists the connections.

15

The tab I have, thanks - a screenshot will take a little while.

17

I deleted the post as it potentially contained your credentials.

Please post a screenshot where we can see the status codes (outcomes) of the requests and no Authorization headers.

18

That is most kind and thoughtful.

I may need a bit of guidance in getting what you seek - so sorry to be a nuisance!

B.

19

Here is a log of the system prior to the error occurring. I shall try to catch it ‘red-handed’, as we say in England!

Screenshot from 2016-06-07 07:13:33.png1321×744 113 KB

20

So this doesn’t show status codes od anything, so it’s not obvious what state it’s in.

I suspect the requests haven’t completed yet in general, and it’s due to still trying to do the initial scan with 1.9MB/s hashing speed, which might take a while.

21

I have still failed to catch the arrival of “Connection error: …” as it happens, I regret.

However a quick check this morning showed this:

2016-06-08 01:21:51: Joining relay session (BEP/relay): Incorrect response code 2: already connected 2016-06-08 01:46:22: Joining relay session (BEP/relay): Incorrect response code 2: already connected 2016-06-08 07:10:12: Joining relay session (BEP/relay): Incorrect response code 1: not found