# Loopback connection. This can be an Attack DDOS ?

**URL:** <https://community.wowza.com/t/loopback-connection-this-can-be-an-attack-ddos/41048>\
**Category:** Wowza Streaming Engine\
**Created:** [September 14, 2015, 11:19am UTC](https://community.wowza.com/t/loopback-connection-this-can-be-an-attack-ddos/41048 "2015-09-14T11:19:01Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bruno\_galamba](https://avatars.discourse-cdn.com/v4/letter/b/85e7bf/32.png) [@Bruno\_galamba](https://community.wowza.com/u/Bruno_galamba)\
**Post date:** [September 14, 2015, 11:19am UTC](https://community.wowza.com/t/loopback-connection-this-can-be-an-attack-ddos/41048/1 "2015-09-14T11:19:01Z")

</div>

Hi Everybody,

So I’m receiving this logs bellow, but this are in the several servers and all are differents versions wowza and java. I guess that an attack DDOS. After begin this messages the wowza show me is online, but dont working, and same restarting wowza the problem persist. Only restarting server to work again.

```auto
#Version: 1.0
#Start-Date: 2015-09-11 00:02:19 BRT
#Software: Wowza Streaming Engine 4.1.2 build13947
#Date: 2015-09-11
#Fields: x-severity	x-category	x-event	date	time	c-client-id	c-ip	c-port	cs-bytes	sc-bytes	x-duration	x-sname	x-stream-id	x-spos	sc-stream-bytes	cs-stream-bytes	x-file-size	x-file-length	x-ctx	x-comment
WARN	server	comment	2015-09-11	00:02:19	-	-	-	-	-	110825.681	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:02:20	-	-	-	-	-	110826.275	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:07:19	-	-	-	-	-	111125.648	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:07:20	-	-	-	-	-	111126.105	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:09:13	-	-	-	-	-	111239.438	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:09:23	-	-	-	-	-	111249.161	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:12:20	-	-	-	-	-	111425.992	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:12:20	-	-	-	-	-	111426.531	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:17:19	-	-	-	-	-	111725.35	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:17:20	-	-	-	-	-	111725.851	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:18:09	-	-	-	-	-	111775.213	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:19:24	-	-	-	-	-	111849.985	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:22:20	-	-	-	-	-	112025.825	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:22:20	-	-	-	-	-	112026.421	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:27:20	-	-	-	-	-	112325.818	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:27:20	-	-	-	-	-	112326.35	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:29:23	-	-	-	-	-	112449.044	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:32:20	-	-	-	-	-	112626.205	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:32:21	-	-	-	-	-	112626.779	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:37:20	-	-	-	-	-	112925.886	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:37:20	-	-	-	-	-	112926.456	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:39:23	-	-	-	-	-	113049.27	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:42:21	-	-	-	-	-	113226.73	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:42:21	-	-	-	-	-	113227.302	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:47:21	-	-	-	-	-	113526.764	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:47:21	-	-	-	-	-	113527.34	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:49:24	-	-	-	-	-	113650.376	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:52:20	-	-	-	-	-	113826.424	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:52:21	-	-	-	-	-	113826.954	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:57:21	-	-	-	-	-	114126.902	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:57:21	-	-	-	-	-	114127.474	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	00:59:24	-	-	-	-	-	114250.624	-	-	-	-	-	-	-	-	Unexpected exception.: java.io.IOException: Unable to establish loopback connection|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)|at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)|at java.security.AccessController.doPrivileged(Native Method)|at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)|at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)|
WARN	server	comment	2015-09-11	01:02:20	-	-	-	-	-	114426.511	-	-

```

Thank you

---

<div class="post-metadata">

**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\
**Post date:** [September 14, 2015, 10:13am UTC](https://community.wowza.com/t/loopback-connection-this-can-be-an-attack-ddos/41048/2 "2015-09-14T10:13:47Z")

</div>

Hello there.

Please take a look at this forum post with this issue and a possible solution for your particular case:

[Server Error: Unable to establish loopback connection](http://community.wowza.com/t/-/41453)

Regards,

Salvadore

---

<div class="post-metadata">

**Author:** ![Bruno\_galamba](https://avatars.discourse-cdn.com/v4/letter/b/85e7bf/32.png) [@Bruno\_galamba](https://community.wowza.com/u/Bruno_galamba)\
**Post date:** [September 14, 2015, 1:17pm UTC](https://community.wowza.com/t/loopback-connection-this-can-be-an-attack-ddos/41048/3 "2015-09-14T13:17:53Z")

</div>

> Hello there.
> 
> Please take a look at this forum post with this issue and a possible solution for your particular case:
> 
> [Server Error: Unable to establish loopback connection](http://community.wowza.com/t/-/41453)
> 
> Regards,
> 
> Salvadore

Thank you Salvadore but I saw this post and was applied this suggestion.

I only know if was real problem about this. If only simple problem or a true attack DDOS.