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Posted to users@httpd.apache.org by da...@di.ubi.pt on 2017/04/13 11:10:30 UTC
[users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote
server returned by /"
Hello all.
I want to use apache as a reverse proxy for an internel IIS site. I was unable to Setup Reverse proxy, so, for testing purposes, my internal site is a network printer web page.
My Setup:
Internet -> Internet Ip address ----------------------→ printer web server
(dns website)
(dns website-for-internal)
My apache webserver is configured with 2 virtual hosts, one for the site itself, the other for the internal website.
When accessing website-for-internal, the apache logs show “proxy: Error Reading from remote server returned by/”
Httpd.conf
<VirtualHost my.internet.ip:80>
ServerName website
DocumentRoot /var/www/html/
DirectoryIndex index.php
</VirtualHost>
<VirtualHost my.internet.ip:80>
ServerName website-for-internal
ProxyRequests Off
ProxyPreserveHost on
ProxyPass / http://10.0.0.130/
ProxyPassReverse / http://10.0.0.130/
</VirtualHost>
At this point I’ve even tried to Setup the reverse proxy without using a virtual host but I get the same result.
Also with different settings with the Proxy configuration (retry=0, Keepalive=on, connectiontimeout=5, timeout=30, etc,etc)
wireshark shows incoming and outgoing traffic for the internal Ip adress.
Browser error:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.
Reason: Error reading from remote server
Any ideas please?
Thanks and regards
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior
FW: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy:
Errorreading from remote server returned by /" [SOLVED-nat messing up
replies]
Posted by da...@di.ubi.pt.
Found out what the problem is.
Printer web site (and the II server to) has gateway address of vyos (router/firewall) which is Nating the LAN.
The traffic for my.server.IP is being NATed and of course replies get lost. I was not capturing the traffic in the correct machine.
Thanks for your time. I’ll have to figure out a solution, hoping not having to change the gateway address on my internal server.
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior
De: Alexandru Duzsardi
Enviado: 13 de abril de 2017 15:01
Para: david@di.ubi.pt
Assunto: RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
It looks to me that your are proxying from 10.0.0.130 to the same host
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2158): proxy: connecting http://10.0.0.130/ to 10.0.0.130:80
Also <VirtualHost my.internet.ip:80>
Is that IP address actually configured on the server ?
----
From: david@di.ubi.pt [mailto:david@di.ubi.pt]
Sent: Thursday, April 13, 2017 4:54 PM
To: Alexandru Duzsardi <al...@pitechnologies.ro>
Subject: RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
In fact
[Thu Apr 13 14:51:21 2017] [debug] mod_proxy_http.c(56): proxy: HTTP: canonicalising URL //10.0.0.130/
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(1525): [client my.server.IP] proxy: http: found worker http://10.0.0.130/ for http://10.0.0.130/
[Thu Apr 13 14:51:21 2017] [debug] mod_proxy.c(1026): Running scheme http handler (attempt 0)
[Thu Apr 13 14:51:21 2017] [debug] mod_proxy_http.c(2018): proxy: HTTP: serving URL http://10.0.0.130/
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2102): proxy: HTTP: has acquired connection for (10.0.0.130)
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2158): proxy: connecting http://10.0.0.130/ to 10.0.0.130:80
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2289): proxy: connected / to 10.0.0.130:80
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2540): proxy: HTTP: fam 2 socket created to connect to 10.0.0.130
[Thu Apr 13 14:51:21 2017] [debug] proxy_util.c(2672): proxy: HTTP: connection complete to 10.0.0.130:80 (10.0.0.130)
But then timeout
[Thu Apr 13 14:52:21 2017] [error] [client my.server.IP] (70007)The timeout specified has expired: proxy: error reading status line from remote server 10.0.0.130
[Thu Apr 13 14:52:21 2017] [debug] mod_proxy_http.c(1448): [client my.server.IP] proxy: read timeout
[Thu Apr 13 14:52:21 2017] [debug] mod_proxy_http.c(1499): [client my.server:IP] proxy: NOT Closing connection to client although reading from backend server 10.0.0.130 failed.
[Thu Apr 13 14:52:21 2017] [error] [client my.server.IP] proxy: Error reading from remote server returned by /
[Thu Apr 13 14:52:21 2017] [debug] proxy_util.c(2120): proxy: HTTP: has released connection for (10.0.0.130)
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior
De: Alexandru Duzsardi
Enviado: 13 de abril de 2017 14:35
Para: david@di.ubi.pt
Assunto: RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
I would recommend enabling http://httpd.apache.org/docs/current/mod/core.html#errorlog and maybe set the level to debug http://httpd.apache.org/docs/current/mod/core.html#loglevel
----
From: david@di.ubi.pt [mailto:david@di.ubi.pt]
Sent: Thursday, April 13, 2017 4:09 PM
To: Alexandru Duzsardi <al...@pitechnologies.ro>
Subject: RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
Thanks for the reply.
From my LAN i can access with or without the trailing slash.
There are no firewall issues because, as I wrote, wireshark shows incoming and outgoing traffic from external web server to internal one.
Regards.
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior
De: Alexandru Duzsardi
Enviado: 13 de abril de 2017 13:55
Para: users@httpd.apache.org
Assunto: RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
What happens if you try to access http://10.0.0.130/ from your dektop computer inside the LAN
Type it exactly like that with a / (slash) at the end. If you can access it , check if your proxy has access to your printer’s IP maybe a firewall or something is in the way.
From: david@di.ubi.pt [mailto:david@di.ubi.pt]
Sent: Thursday, April 13, 2017 2:11 PM
To: users@httpd.apache.org
Subject: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
Hello all.
I want to use apache as a reverse proxy for an internel IIS site. I was unable to Setup Reverse proxy, so, for testing purposes, my internal site is a network printer web page.
My Setup:
Internet -> Internet Ip address ----------------------→ printer web server
(dns website)
(dns website-for-internal)
My apache webserver is configured with 2 virtual hosts, one for the site itself, the other for the internal website.
When accessing website-for-internal, the apache logs show “proxy: Error Reading from remote server returned by/”
Httpd.conf
<VirtualHost my.internet.ip:80>
ServerName website
DocumentRoot /var/www/html/
DirectoryIndex index.php
</VirtualHost>
<VirtualHost my.internet.ip:80>
ServerName website-for-internal
ProxyRequests Off
ProxyPreserveHost on
ProxyPass / http://10.0.0.130/
ProxyPassReverse / http://10.0.0.130/
</VirtualHost>
At this point I’ve even tried to Setup the reverse proxy without using a virtual host but I get the same result.
Also with different settings with the Proxy configuration (retry=0, Keepalive=on, connectiontimeout=5, timeout=30, etc,etc)
wireshark shows incoming and outgoing traffic for the internal Ip adress.
Browser error:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.
Reason: Error reading from remote server
Any ideas please?
Thanks and regards
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior
RE: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
Posted by Alexandru Duzsardi <al...@pitechnologies.ro>.
What happens if you try to access http://10.0.0.130/ from your dektop computer inside the LAN
Type it exactly like that with a / (slash) at the end. If you can access it , check if your proxy has access to your printer’s IP maybe a firewall or something is in the way.
From: david@di.ubi.pt [mailto:david@di.ubi.pt]
Sent: Thursday, April 13, 2017 2:11 PM
To: users@httpd.apache.org
Subject: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Error reading from remote server returned by /"
Hello all.
I want to use apache as a reverse proxy for an internel IIS site. I was unable to Setup Reverse proxy, so, for testing purposes, my internal site is a network printer web page.
My Setup:
Internet -> Internet Ip address ------------------------> printer web server
(dns website)
(dns website-for-internal)
My apache webserver is configured with 2 virtual hosts, one for the site itself, the other for the internal website.
When accessing website-for-internal, the apache logs show “proxy: Error Reading from remote server returned by/”
Httpd.conf
<VirtualHost my.internet.ip:80>
ServerName website
DocumentRoot /var/www/html/
DirectoryIndex index.php
</VirtualHost>
<VirtualHost my.internet.ip:80>
ServerName website-for-internal
ProxyRequests Off
ProxyPreserveHost on
ProxyPass / http://10.0.0.130/
ProxyPassReverse / http://10.0.0.130/
</VirtualHost>
At this point I’ve even tried to Setup the reverse proxy without using a virtual host but I get the same result.
Also with different settings with the Proxy configuration (retry=0, Keepalive=on, connectiontimeout=5, timeout=30, etc,etc)
wireshark shows incoming and outgoing traffic for the internal Ip adress.
Browser error:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET <http://teste.di.ubi.pt/> /.
Reason: Error reading from remote server
Any ideas please?
Thanks and regards
Os melhores cumprimentos
David Alexandre M. de Carvalho
---------------------------------------
Especialista de Informática
Departamento de Informática
Universidade da Beira Interior