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From <da...@di.ubi.pt>
Subject FW: [users@httpd] httpd 2.2.15-59 Reverse Proxy " proxy: Errorreading from remote server returned by /" [SOLVED-nat messing up replies]
Date Thu, 13 Apr 2017 15:16:31 GMT


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 <alexandru.duzsardi@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 <alexandru.duzsardi@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






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