# Elastic-agents goes offline and get back online status frequently **URL:** \ **Category:** Elastic Agent\ **Created:** [November 15, 2023, 7:17am UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195 "2023-11-15T07:17:23Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![cLaYYs](https://avatars.discourse-cdn.com/v4/letter/c/a5b964/32.png) [@cLaYYs](https://discuss.elastic.co/u/cLaYYs)\ **Post date:** [November 15, 2023, 7:17am UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/1 "2023-11-15T07:17:23Z")
Hi All, Version:8.9 OS:Windows Server I have encountered with this problem so recently. And it is not occurs for all elastic-agents. it happens for 4 elastic-agents. The problem is the agent status seems offline when ı checked from kibana gui. But it sends logs clearly, ı think there should be communication problem between elestic-agent and fleet server. But ı can not understand the real problem. I'm sharing the agent's logs. ```auto 07:08:13.030 elastic_agent [elastic_agent][error] Checkin request to fleet-server succeeded after 1 failures 07:21:29.180 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 07:28:51.054 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 07:41:44.423 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 07:54:34.937 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 08:11:25.420 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 08:20:53.701 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 08:30:14.602 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 08:42:26.377 elastic_agent [elastic_agent][error] Checkin request to fleet-server succeeded after 9 failures 09:03:33.907 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 09:14:47.144 elastic_agent [elastic_agent][error] Checkin request to fleet-server succeeded after 3 failures 09:30:03.732 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 09:37:10.745 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 09:53:40.139 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying 09:53:40.139 elastic_agent [elastic_agent][error] Cannot checkin in with fleet-server, retrying ``` And also the another weird thing that ı saw in the fleet server is the fleet running on ipv6 for 8220 port. Also it is running for localhost:8221 on ipv4. I do not know how that happens. Because we set it up for ipv4. Any help would be good for us. ---
**Author:** ![cLaYYs](https://avatars.discourse-cdn.com/v4/letter/c/a5b964/32.png) [@cLaYYs](https://discuss.elastic.co/u/cLaYYs)\ **Post date:** [November 15, 2023, 2:31pm UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/2 "2023-11-15T14:31:56Z")
```auto log.level":"warn","@timestamp":"2023-11-07T11:47:48.571Z","log.origin":{"file.name":"fleet/fleet_gateway.go","file.line":194},"message":"Possible transient error during checkin with fleet-server, retrying","log":{"source":"elastic-agent"},"error":{"message":"fail to checkin to fleet-server: all hosts failed: 1 error occurred:\n\t* requester 0/1 to host https://[IP]:8220/ errored: Post \"https://[IP]:8220/api/fleet/agents/c8838828-5def-49dd-89ce-69fa3acefd50/checkin?\": read tcp [IP]:49630->[IP]:8220: wsarecv: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.\n\n"},"request_duration_ns":180379102200,"failed_checkins":2,"retry_after_ns":178401279067,"ecs.version":"1.6.0" ``` This is the actual error. it could help to solve the problem. ---
**Author:** ![cLaYYs](https://avatars.discourse-cdn.com/v4/letter/c/a5b964/32.png) [@cLaYYs](https://discuss.elastic.co/u/cLaYYs)\ **Post date:** [November 16, 2023, 3:04pm UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/3 "2023-11-16T15:04:45Z")
any help guys? ---
**Author:** ![cLaYYs](https://avatars.discourse-cdn.com/v4/letter/c/a5b964/32.png) [@cLaYYs](https://discuss.elastic.co/u/cLaYYs)\ **Post date:** [November 20, 2023, 8:35am UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/4 "2023-11-20T08:35:43Z")
Hi @MichelLaterman, Do you have any chance to look at this case ? Regards ---
**Author:** ![MichelLaterman](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/michellaterman/32/110221_2.png) [@MichelLaterman](https://discuss.elastic.co/u/MichelLaterman)\ **Post date:** [November 20, 2023, 4:50pm UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/5 "2023-11-20T16:50:17Z")
This looks like a network issue. Running on port 8221 is expected (fleet-server starts a local communication port for the local elastic-agent that runs it). Do you have proxies on your network between the agents and fleet-server? Can you provide a diagnostics bundle? ---
**Author:** ![cLaYYs](https://avatars.discourse-cdn.com/v4/letter/c/a5b964/32.png) [@cLaYYs](https://discuss.elastic.co/u/cLaYYs)\ **Post date:** [November 21, 2023, 7:46am UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/6 "2023-11-21T07:46:48Z")
Hi @MichelLaterman, Thanks for the response, There is no proxy between agents and fleet-server. just firewall. also, there is no drop in fw. Also whenever ı telnet the fleet server, ı can reach the server. How can ı share the diagnostic in a safe way? Regards ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 19, 2023, 7:47am UTC](https://discuss.elastic.co/t/elastic-agents-goes-offline-and-get-back-online-status-frequently/347195/7 "2023-12-19T07:47:14Z")
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