Sensu agent installed in windows is not connecting to backend

Sensu Go
1

sensu Agent has been installed in windows machine
Backend url also available in agent,yml
when I started sensu agent service, sensu backed service went down
I observed below logs in backend log

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x3c pc=0xfc7708]

goroutine 251 [running]:
github.com/sensu/sensu-go/backend/keepalived.createKeepaliveEvent(0xc42018de30, 0x1786680)
        /go/src/github.com/sensu/sensu-go/backend/keepalived/keepalived.go:256 +0x128
github.com/sensu/sensu-go/backend/keepalived.(*Keepalived).handleUpdate(0xc42016aa00, 0xc42018de30, 0xc4200aa080, 0xc421788c00)
        /go/src/github.com/sensu/sensu-go/backend/keepalived/keepalived.go:307 +0x1be
github.com/sensu/sensu-go/backend/keepalived.(*Keepalived).processKeepalives(0xc42016aa00)
        /go/src/github.com/sensu/sensu-go/backend/keepalived/keepalived.go:223 +0x24d
created by github.com/sensu/sensu-go/backend/keepalived.(*Keepalived).startWorkers
        /go/src/github.com/sensu/sensu-go/backend/keepalived/keepalived.go:177 +0x87```


I can see below logs in agent log

```{"component":"agent","level":"info","msg":"starting statsd server on address: 127.0.0.1:8125","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","event":{"Title":"Gostatsd started","Text":"Gostatsd started","DateHappened":1542204141,"Hostname":"<AgentHostname>","AggregationKey":"","SourceTypeName":"","Tags":null,"SourceIP":"","Priority":1,"AlertType":0},"level":"info","msg":"statsd received an event","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"sending keepalive","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"starting UDP listener on address: 127.0.0.1:3030","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"starting TCP listener on address: 127.0.0.1:3030","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"starting api on address: 127.0.0.1:3031","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"connected - starting receivePump","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","level":"info","msg":"connected - starting sendPump","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","error":"Connection error: websocket: close 1006 (abnormal closure): unexpected EOF","level":"error","msg":"transport receive error","time":"2018-11-14T09:02:21-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:23-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:24-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:26-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:29-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:33-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:39-05:00"}
{"component":"agent","level":"info","msg":"sending keepalive","time":"2018-11-14T09:02:41-05:00"}
{"component":"agent","error":"Connection closed: the websocket connection is no longer open","level":"warning","msg":"transport send error","time":"2018-11-14T09:02:41-05:00"}
{"component":"agent","error":"dial tcp {<Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:02:48-05:00"}
{"component":"agent","level":"info","msg":"sending keepalive","time":"2018-11-14T09:03:01-05:00"}
{"component":"agent","error":"Connection closed: the websocket connection is no longer open","level":"warning","msg":"transport send error","time":"2018-11-14T09:03:01-05:00"}
{"component":"agent","error":"dial tcp {Backend IP}:8081: connectex: No connection could be made because the target machine actively refused it.","level":"error","msg":"reconnection attempt failed","time":"2018-11-14T09:03:06-05:00"}```



Could you please let me know what has gone wrong
2

@balajik515 can you please wrap your code/error blocks in ```? This will make it much easier to read for those troubleshooting the issue.

3

Hi @balajik515,

Can you tell me the exact version of the Sensu agent and the Sensu backend? We identified a similar problem when running older agents with a recent version of the backend:

If that’s the case, I’d recommend to make sure to run the same version across your agents and backend.

4

sensu backedn 5.0.0-1 & sensu agent 5.0.0-1

5

I will need the exact version installed, which you can get by running the following commands:

sensu-backend version

sensu-agent version

Thanks!

6

sensu-agent version 2.0.0-beta.4-4#a05ad41, build a05ad411199077286f49c06629eed4823331176c, built 2018-08-16T21:12:56+00
00

sensu-backend version 2.0.0-beta.7-7#0ad392d, build 0ad392d15948e7cc38fdb93a9ada56aa05f42970, built 2018-10-26T17:07:52+0000

This agent we installed in windows.Its not working only in windows
But it is working in rhel

7

As you can see, the agent and the backend are running two different version (beta.7 vs beta.4), which is causing this issue:

Unfortunately Windows packages for the sensu-agent are no longer published for the moment. The easiest solution would probably to manually build a Windows binary for the agent from the source code, using the 2.0.0-beta.7-1 tag. Let us know if you need help with that.