# Backend Namespace Cannot get a server socket

**URL:** <https://discourse.haproxy.org/t/backend-namespace-cannot-get-a-server-socket/1108>\
**Category:** Help!\
**Created:** [March 24, 2017, 2:43am UTC](https://discourse.haproxy.org/t/backend-namespace-cannot-get-a-server-socket/1108 "2017-03-24T02:43:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Chris71](https://avatars.discourse-cdn.com/v4/letter/c/e56c9b/32.png) [@Chris71](https://discourse.haproxy.org/u/Chris71)\
**Post date:** [March 24, 2017, 2:43am UTC](https://discourse.haproxy.org/t/backend-namespace-cannot-get-a-server-socket/1108/1 "2017-03-24T02:43:25Z")

</div>

Hi,  
I am getting a general socket error when trying to connect the haproxy backend server using a namespace. It connects fine on the frontend. Both the frontend and backend are using the same namespace but different interfaces. If I perform a wget from inside the namespace, I can retrieve the web page that the backend server is trying to connect too. Anyone got any clues to why the backend server cannot connect.

[WARNING] 082/114316 (15384) : Server b\_http\_P1234518P/P1234518P is DOWN, reason: Layer4 connection problem, info: “General socket error”

ip netns exec P1234518P wget http\_//172.17.55.240:80/portal --no-check-certificate  
–2017-03-24 12:31:45-- http\_//172.17.55.240/portal  
Connecting to 172.17.55.240:80… connected.  
HTTP request sent, awaiting response… 301 Moved Permanently  
Location: http\_//172.17.55.240/portal/ [following]  
–2017-03-24 12:31:45-- http\_//172.17.55.240/portal/  
Reusing existing connection to 172.17.55.240:80.  
HTTP request sent, awaiting response… 302 Found  
Location: https\_//172.17.55.240/portal [following]  
–2017-03-24 12:31:45-- https\_//172.17.55.240/portal

namespace\_list  
namespace P1234518P

frontend f\_http\_P1234518P  
mode http  
bind 192.168.165.64:80 namespace P1234518P name http\_P1234518P  
default\_backend b\_http\_P1234518P

backend b\_http\_P1234518P  
mode http  
server P1234518P 172.17.55.240:80 namespace P1234518P check

HA-Proxy version 1.7.3 2017/02/28  
Copyright 2000-2017 Willy Tarreau [willy@haproxy.org](mailto:willy@haproxy.org)

Build options :  
TARGET = linux2628  
CPU = generic  
CC = gcc  
CFLAGS = -m64 -march=x86-64 -O2 -g -fno-strict-aliasing -Wdeclaration-after-statement  
OPTIONS = USE\_OPENSSL=1 USE\_NS=1

Default settings :  
maxconn = 2000, bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Encrypted password support via crypt(3): yes  
Built without compression support (neither USE\_ZLIB nor USE\_SLZ are set)  
Compression algorithms supported : identity(“identity”)  
Built with OpenSSL version : OpenSSL 1.0.1t 3 May 2016  
Running on OpenSSL version : OpenSSL 1.0.1t 3 May 2016  
OpenSSL library supports TLS extensions : yes  
OpenSSL library supports SNI : yes  
OpenSSL library supports prefer-server-ciphers : yes  
Built without PCRE support (using libc’s regex instead)  
Built without Lua support  
Built with transparent proxy support using: IP\_TRANSPARENT IPV6\_TRANSPARENT IP\_FREEBIND  
Built with network namespace support

Available polling systems :  
epoll : pref=300, test result OK  
poll : pref=200, test result OK  
select : pref=150, test result OK  
Total: 3 (3 usable), will use epoll.

Available filters :  
[COMP] compression  
[TRACE] trace  
[SPOE] spoe