# TCP connections to itself? **URL:** \ **Category:** Elasticsearch\ **Created:** [April 11, 2018, 4:35pm UTC](https://discuss.elastic.co/t/tcp-connections-to-itself/127680 "2018-04-11T16:35:24Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![dmarlow](https://avatars.discourse-cdn.com/v4/letter/d/958977/32.png) [@dmarlow](https://discuss.elastic.co/u/dmarlow)\ **Post date:** [April 11, 2018, 4:35pm UTC](https://discuss.elastic.co/t/tcp-connections-to-itself/127680/1 "2018-04-11T16:35:24Z")
Is it normal for ES to open many connections to itself? I'm on ES version 6.1.1. I have 3 machines in a cluster (internal IPs are: 172.16.2.4, 2.5 and 2.6). Is it normal for all of the 127.0.0.1 connections to itself?When doing **netstat -aon** , I see about 100 entries that look like this: ``` Proto Local Address Foreign Address State PID TCP 127.0.0.1:9200 127.0.0.1:60324 ESTABLISHED 10160 TCP 127.0.0.1:59300 127.0.0.1:59301 ESTABLISHED 10160 TCP 127.0.0.1:59301 127.0.0.1:59300 ESTABLISHED 10160 TCP 127.0.0.1:59302 127.0.0.1:59303 ESTABLISHED 10160 TCP 127.0.0.1:59303 127.0.0.1:59302 ESTABLISHED 10160 TCP 127.0.0.1:59304 127.0.0.1:59305 ESTABLISHED 10160 TCP 127.0.0.1:59305 127.0.0.1:59304 ESTABLISHED 10160 TCP 127.0.0.1:59306 127.0.0.1:59307 ESTABLISHED 10160 TCP 127.0.0.1:59307 127.0.0.1:59306 ESTABLISHED 10160 TCP 127.0.0.1:59308 127.0.0.1:59309 ESTABLISHED 10160 TCP 127.0.0.1:59309 127.0.0.1:59308 ESTABLISHED 10160 TCP 127.0.0.1:59310 127.0.0.1:59311 ESTABLISHED 10160 TCP 127.0.0.1:59311 127.0.0.1:59310 ESTABLISHED 10160 TCP 127.0.0.1:59312 127.0.0.1:59313 ESTABLISHED 10160 TCP 127.0.0.1:59313 127.0.0.1:59312 ESTABLISHED 10160 TCP 127.0.0.1:59314 127.0.0.1:59315 ESTABLISHED 10160 TCP 127.0.0.1:59315 127.0.0.1:59314 ESTABLISHED 10160 TCP 127.0.0.1:59316 127.0.0.1:59317 ESTABLISHED 10160 TCP 127.0.0.1:59317 127.0.0.1:59316 ESTABLISHED 10160 TCP 127.0.0.1:59318 127.0.0.1:59319 ESTABLISHED 10160 TCP 127.0.0.1:59319 127.0.0.1:59318 ESTABLISHED 10160 TCP 127.0.0.1:59320 127.0.0.1:59321 ESTABLISHED 10160 TCP 127.0.0.1:59321 127.0.0.1:59320 ESTABLISHED 10160 TCP 127.0.0.1:59322 127.0.0.1:59323 ESTABLISHED 10160 TCP 127.0.0.1:59323 127.0.0.1:59322 ESTABLISHED 10160 TCP 127.0.0.1:59324 127.0.0.1:59325 ESTABLISHED 10160 TCP 127.0.0.1:59325 127.0.0.1:59324 ESTABLISHED 10160 TCP 127.0.0.1:59326 127.0.0.1:59327 ESTABLISHED 10160 TCP 127.0.0.1:59327 127.0.0.1:59326 ESTABLISHED 10160 TCP 127.0.0.1:59328 127.0.0.1:59329 ESTABLISHED 10160 TCP 127.0.0.1:59329 127.0.0.1:59328 ESTABLISHED 10160 TCP 127.0.0.1:59330 127.0.0.1:59331 ESTABLISHED 10160 TCP 127.0.0.1:59331 127.0.0.1:59330 ESTABLISHED 10160 TCP 127.0.0.1:59332 127.0.0.1:59333 ESTABLISHED 10160 TCP 127.0.0.1:59333 127.0.0.1:59332 ESTABLISHED 10160 TCP 127.0.0.1:59334 127.0.0.1:59335 ESTABLISHED 10160 TCP 127.0.0.1:59335 127.0.0.1:59334 ESTABLISHED 10160 TCP 127.0.0.1:59336 127.0.0.1:59337 ESTABLISHED 10160 TCP 127.0.0.1:59337 127.0.0.1:59336 ESTABLISHED 10160 TCP 127.0.0.1:59338 127.0.0.1:59339 ESTABLISHED 10160 TCP 127.0.0.1:59339 127.0.0.1:59338 ESTABLISHED 10160 TCP 127.0.0.1:59340 127.0.0.1:59341 ESTABLISHED 10160 TCP 127.0.0.1:59341 127.0.0.1:59340 ESTABLISHED 10160 TCP 127.0.0.1:59342 127.0.0.1:59343 ESTABLISHED 10160 TCP 127.0.0.1:59343 127.0.0.1:59342 ESTABLISHED 10160 TCP 127.0.0.1:59344 127.0.0.1:59345 ESTABLISHED 10160 TCP 127.0.0.1:59345 127.0.0.1:59344 ESTABLISHED 10160 TCP 127.0.0.1:59346 127.0.0.1:59347 ESTABLISHED 10160 TCP 127.0.0.1:59347 127.0.0.1:59346 ESTABLISHED 10160 TCP 127.0.0.1:59348 127.0.0.1:59349 ESTABLISHED 10160 TCP 127.0.0.1:59349 127.0.0.1:59348 ESTABLISHED 10160 TCP 127.0.0.1:59350 127.0.0.1:59351 ESTABLISHED 10160 TCP 127.0.0.1:59351 127.0.0.1:59350 ESTABLISHED 10160 TCP 127.0.0.1:59352 127.0.0.1:59353 ESTABLISHED 10160 TCP 127.0.0.1:59353 127.0.0.1:59352 ESTABLISHED 10160 TCP 127.0.0.1:59354 127.0.0.1:59355 ESTABLISHED 10160 TCP 127.0.0.1:59355 127.0.0.1:59354 ESTABLISHED 10160 TCP 127.0.0.1:59356 127.0.0.1:59357 ESTABLISHED 10160 ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 9, 2018, 4:35pm UTC](https://discuss.elastic.co/t/tcp-connections-to-itself/127680/2 "2018-05-09T16:35:37Z")
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