Weird logging on high loglevel

Zero Trust Cloudflare Tunnel
1

What is the name of the domain?

example.com

What is the error number?

Application error 0x0 (remote)

What is the error message?

Application error 0x0 (remote)

What is the issue you’re encountering

Weird logging on high loglevel

What steps have you taken to resolve the issue?

I have step up the log file and log leve. When using the standard the info I can the tunnels connects and gets config

{"level":"info","time":"2024-07-01T18:40:32Z","message":"GOOS: linux, GOVersion: go1.22.2-devel-cf, GoArch: amd64"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"Settings: map[no-autoupdate:true]"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"Environmental variables map[TUNNEL_LOGFILE:/tmp/tunnel.log TUNNEL_LOGLEVEL:info TUNNEL_METRICS:0.0.0.0:60123 TUNNEL_TOKEN:*****]"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"Generated Connector ID: 41d24395-55a0-4112-9240-04e3c371fb5c"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"Initial protocol quic"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"ICMP proxy will use 192.168.48.4 as source for IPv4"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"ICMP proxy will use ::1 in zone lo as source for IPv6"}
{"level":"info","time":"2024-07-01T18:40:32Z","message":"Starting metrics server on [::]:60123/metrics"}
{"level":"info","event":0,"connection":"bef070b1-8b85-4142-867c-813715d493e2","connIndex":0,"location":"ams06","ip":"198.41.200.63","protocol":"quic","time":"2024-07-01T18:40:32Z","message":"Registered tunnel connection"}
{"level":"info","event":0,"connection":"098b7cda-045a-49fa-b7a9-a86aa8c49ff9","connIndex":1,"location":"ams15","ip":"198.41.192.227","protocol":"quic","time":"2024-07-01T18:40:33Z","message":"Registered tunnel connection"}
{"level":"info","event":0,"connection":"a771a871-6ca0-4ec8-8fca-055212d4e6f0","connIndex":2,"location":"ams01","ip":"198.41.200.233","protocol":"quic","time":"2024-07-01T18:40:34Z","message":"Registered tunnel connection"}
{"level":"info","event":0,"connection":"8f3df6dc-1ffa-4ffd-8f10-8ec58f8de966","connIndex":3,"location":"ams08","ip":"198.41.192.37","protocol":"quic","time":"2024-07-01T18:40:34Z","message":"Registered tunnel connection"}
{"level":"info","version":4,"config":"{\"ingress\":[{\"hostname\":\"stt.example.com\",\"originRequest\":{},\"service\":\"http://speedtest-tracker\"},{\"service\":\"http_status:404\"}],\"warp-routing\":{\"enabled\":false}}","time":"2024-07-01T18:40:36Z","message":"Updated to new configuration"}

Then I set the level to warn or error
I dont see that the tunnels connects and gets a config just a termination

{"level":"error","event":0,"ip":"198.41.200.73","connIndex":3,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Failed to serve quic connection"}
{"level":"error","event":0,"ip":"198.41.200.73","connIndex":3,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Serve tunnel error"}
{"level":"error","event":0,"ip":"198.41.192.57","connIndex":2,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Failed to serve quic connection"}
{"level":"error","event":0,"ip":"198.41.192.57","connIndex":2,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Serve tunnel error"}
{"level":"error","event":0,"ip":"198.41.192.227","connIndex":1,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Failed to serve quic connection"}
{"level":"error","event":0,"ip":"198.41.192.227","connIndex":1,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Serve tunnel error"}
{"level":"error","event":0,"ip":"198.41.200.33","connIndex":0,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Failed to serve quic connection"}
{"level":"error","event":0,"ip":"198.41.200.33","connIndex":0,"error":"Application error 0x0 (remote)","time":"2024-07-01T18:44:16Z","message":"Serve tunnel error"}
{"level":"error","time":"2024-07-01T18:44:16Z","message":"no more connections active and exiting"}
{"level":"error","error":"context canceled","time":"2024-07-01T18:44:16Z","message":"icmp router terminated"}

In all scenario’s the tunnel is up and works. Just the logging that does not seem to reflect what is happening in higher levels.

2

can you connect to the webserver via telnet on the host running cloudflared

3

I dont really understand what you mean with that.
Like i mentioned the tunnel works and traffic is going up and down. The service behind the tunnel can be reached.

Just seems that when turn the log level is turned up to WARN and Error the tunnel stops according to the logs. But that is not the case, and there is no re-connect in the logging either.The logging seem to be broken on high log levels