Re: what is mean 'Failed to connect to 127.0.0.1 port 8001: Connection refused'

ghlee · ‎27 May 2020

I have a question.

I deployed oneagent on AWS k8s.

But I cannot monitor they are.

So, I confirmed ../log/os/[ruxitagent_host_.. ]

It shows like this

" 2020-05-26 01:47:33.592 UTC [11c99eea] warning [native] Unable to do initial setup because no server is reachable. Last error: Failed to connect to 127.0.0.1 port 8001: Connection refused "

What does mean like?

It may oneagent try to connect web server in localhost ?

and it is default port 8001?

Julius_Loman · ‎27 May 2020

How exactly did you deploy the agent? Can you share the details?

Certified Dynatrace Master | Alanata a.s., Slovakia, Dynatrace Master Partner

Tao_Zhang · ‎10 Sep 2020

I have exactly same issue, just different port '8020'. It worked fine until an automatic upgrade or restart, then it gives the error. Can anybody help here?

2020-07-08 07:25:01.987 UTC [993ff803] info [native] Applied configuration from file: /opt/dynatrace/oneagent/agent/conf/ruxitagent.conf

2020-07-08 07:25:01.994 UTC [993ff803] info [native] OsAgent net namespace: net:[4026531956]

2020-07-08 07:25:01.994 UTC [993ff803] info [native] OsAgent pid namespace: pid:[4026531836]

2020-07-08 07:25:01.994 UTC [993ff803] info [native] Pid namespace available in /proc/self/status: false

2020-07-08 07:25:01.994 UTC [993ff803] info [native] Detected kernel version: 3.10.0-1062.12.1.el7.x86_64

2020-07-08 07:25:01.994 UTC [993ff803] info [native] Unix socket detection is on

2020-07-08 07:25:02.001 UTC [993ff803] info [native] ConfigFromServer: Loading agent runtime configuration from /var/lib/dynatrace/oneagent/a

gent/runtime/0x0000000000000000_os_0/runtimeConfiguration_v2

2020-07-08 07:25:02.005 UTC [993ff803] info [native] ConfigFromServer: Runtime configuration revision 54889213539892583 loaded.

2020-07-08 07:25:02.005 UTC [993ff803] info [native] ConfigFromServer: Loading JS agent from /var/lib/dynatrace/oneagent/agent/runtime/shared

/jsagent-10195200626110504.zip

2020-07-08 07:25:02.040 UTC [993ff803] info [native] ConfigFromServer: JS agent version 10195200626110504 loaded.

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting integer property 'sensor.stringTruncationLimit.webrequest' to 4096

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting integer property 'correlation.tagging.version' to 2

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting integer property 'tc.adaptive.TC.RootPathThreshold' to 1000

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting integer property 'tc.subPath.TC.Exponent' to -1

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'debugReEnableOldAutoSensorDotnet' to false

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'sampling.dotnet.enabled' to true

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'correlation.enableV4TraceContextExtension' to false

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'ambient.TC..dotnet.enabled' to false

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'debugEnableRedisTransformerNative' to true

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'debugEnableCustomTracingNative' to false

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'appDomainRegistry.dotnet.enabled' to true

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting boolean property 'threadRegistry.dotnet.enabled' to true

2020-07-08 07:25:02.041 UTC [993ff803] info [native] Setting string property 'agent.osapi.filterrules.exclusions' to 'disk(linux,tmpfs,*);dis

k(linux,rootfs,*);disk(linux,*,/dev);disk(linux,cgroup,*);disk(linux,debugfs,*);disk(linux,iso9660,*);disk(linux,udf,*);disk(linux,squashfs,*);d

isk(aix,cdrfs,*);disk(*,hsfs,*);nic(solaris,mac)'

2020-07-08 07:25:02.042 UTC [993ff803] info [native] POSIX clock type CLOCK_MONOTONIC detected

2020-07-08 07:25:02.343 UTC [993ff803] info [native] High-resolution POSIX timer detected.

2020-07-08 07:25:02.449 UTC [972fb8c3] debug [native] Unable to get EC2 Spot instance-action. Error: curl_easy_perform() failed: Couldn't conn

ect to server

2020-07-08 07:25:02.649 UTC [993ff803] info [native] OSIID: Directory (/var/lib/dynatrace/oneagent/agent/config/) already exists.

2020-07-08 07:25:02.651 UTC [993ff803] info [native] HostName candidate ck-prd-eu-ck1

2020-07-08 07:25:02.651 UTC [993ff803] info [native] Attempting to update /var/lib/dynatrace/oneagent/agent/config/ruxitagentproc.conf

2020-07-08 07:25:02.658 UTC [993ff803] info [native] Using ConcurrentCachedStrings for String Caching, cacheSize=5120

2020-07-08 07:25:02.661 UTC [993ff803] info [native] Connection to initial gateways failed using http://localhost:8020/communication

2020-07-08 07:25:02.661 UTC [993ff803] warning [native] Unable to do initial setup because no server is reachable. Last error: Failed to connect to localhost port 8020: Connection refused

2020-07-08 07:25:02.661 UTC [993ff803] info [native] Dispatcher started - using non working URL http://localhost:8020/communication

2020-07-08 07:25:02.663 UTC [993ff803] info [native] ----------------------------------------------------------------------------------------------

2020-07-08 07:25:02.663 UTC [993ff803] info [native] Version ..................... 1.195.138.20200630-145046, build date 2020.06.30 14:50:46, SCM Rev. 35b0e9f37400a4b27686cdc1c024f73b13ab92ce

2020-07-08 07:25:02.663 UTC [993ff803] info [native] Command line is oneagentos -Dcom.compuware.apm.WatchDogPort=50000 -Dcom.compuware.apm.WatchDogTimeout=900

IzabelaRokita · ‎30 May 2025

Hey @ghlee , did you manage to find the solution to your problem? If so, it would be amazing if you've shared it with the rest of the Community! If not, let me know, and I'll look for some further assistance 😊