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Posted to users@httpd.apache.org by isha b <is...@gmail.com> on 2008/11/04 10:18:34 UTC
Re: [users@httpd] 502 proxy error
Thank you all,
I have increased with Keep Alive upto 300 sec as well No KeepAlive option
buyt the reult is still negative. Still it is throwing the below error
*proxy*: *Error reading from remote server returned* by /..."
proxy: error reading status line from remote server
Further I read in groups that the httpd 2.2.3 might have some bugs which is
causing the problem. Hence I have upgraded my apache to httpd 2.2.10 . Now
the performance is better but still around 40% of the time its end up with
proxy error.
my backend server is on ISS and reverse proxy is on Fedora 6 on httpd 2.2.10
Thanks
Isha
On Thu, Oct 30, 2008 at 7:44 PM, Mehta, Anish <am...@verisign.com> wrote:
> Are you using mod_proxy_ajp and load balancing between backend servers?
> We used to see this error a lot but when we added timeout parameter to
> BalancerMember directive if went away.
>
> You may also want to try this or add the same parameter to ProxyPass
> directive (timeout=300).
>
> Regards,
> AM
>
> -----Original Message-----
> From: Boyle Owen [mailto:Owen.Boyle@six-group.com]
> Sent: Thursday, October 30, 2008 9:31 AM
> To: users@httpd.apache.org
> Subject: RE: [users@httpd] 502 proxy error
>
> ________________________________
>
> From: isha b [mailto:ishaa.b@gmail.com]
> Sent: Thursday, October 30, 2008 12:47 PM
> To: users@httpd.apache.org; users-help@httpd.apache.org;
> users-subscribe@httpd.apache.org
> Subject: [users@httpd] 502 proxy error
>
>
>
>
> Team,
> When I try to access an application using reverse proxy, most of
> the time I will end up with below error. Anybody have an idea what will
> be causing the issue? After few refresh on the page I will get actual
> page but most of the times end up with below proxy error
>
>
>
> Proxy Error
> The proxy server received an invalid response from an upstream
> server.
> The proxy server could not handle the request GET /testingtool/.
> Reason: Error reading from remote server
>
>
> ------------------------------------------------------------------------
> --------
> Apache/2.2.3 (Fedora) Server at testingserver.test.com Port 443
>
>
> Thanks,
> Isha
>
>
> Aoache is the proxy, is it?
>
> It could be the back-end server is not working reliably - what happens
> if you access it drectly?
>
> If it seems OK, how long does it take to respond? If it's a slow
> application it may take longer than apache is prepared to wait (see
> ProxyTimeout, KeepAlivetimeout)
>
> Rgds,
> Owen Boyle
> Disclaimer: Any disclaimer attached to this message may be ignored.
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server
> Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
> ---------------------------------------------------------------------
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> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
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> For additional commands, e-mail: users-help@httpd.apache.org
>
>
Re: [users@httpd] 502 proxy error
Posted by isha b <is...@gmail.com>.
Thank you Alex,
The reverse proxy error log doesn't show any BAD GATEWAY error, The errors
are as below
[Mon Nov 03 18:08:49 2008] [error] [client 121.242.16.5] proxy: error
reading status line from remote server xx.xx.xx.xx
[Mon Nov 03 18:08:49 2008] [error] [client 121.242.16.5] proxy: Error
reading from remote server returned by /AppTool/
[Mon Nov 03 18:10:11 2008] [error] [client 121.242.16.5] proxy: error
reading status line from remote server xx.xx.xx.xx
[Mon Nov 03 18:10:11 2008] [error] [client 121.242.16.5] proxy: Error
reading from remote server returned by /AppTool/
However I am going to give a try as you adviced. I will update the result
later
Thanks
Isha
On Tue, Nov 4, 2008 at 3:06 PM, Alexandru David Constantinescu <
aldavx@gmail.com> wrote:
> isha b wrote:
>
>> Thank you all,
>> I have increased with Keep Alive upto 300 sec as well No KeepAlive option
>> buyt the reult is still negative. Still it is throwing the below error
>> *proxy*: *Error reading from remote server returned* by /..."
>> proxy: error reading status line from remote server
>>
>>
>> Further I read in groups that the httpd 2.2.3 might have some bugs which
>> is causing the problem. Hence I have upgraded my apache to httpd 2.2.10 .
>> Now the performance is better but still around 40% of the time its end up
>> with proxy error.
>> my backend server is on ISS and reverse proxy is on Fedora 6 on httpd
>> 2.2.10
>> Thanks
>> Isha
>>
>>
>> On Thu, Oct 30, 2008 at 7:44 PM, Mehta, Anish <amehta@verisign.com<mailto:
>> amehta@verisign.com>> wrote:
>>
>> Are you using mod_proxy_ajp and load balancing between backend servers?
>> We used to see this error a lot but when we added timeout parameter to
>> BalancerMember directive if went away.
>>
>> You may also want to try this or add the same parameter to ProxyPass
>> directive (timeout=300).
>>
>> Regards,
>> AM
>>
>> -----Original Message-----
>> From: Boyle Owen [mailto:Owen.Boyle@six-group.com
>> <ma...@six-group.com>]
>> Sent: Thursday, October 30, 2008 9:31 AM
>> To: users@httpd.apache.org <ma...@httpd.apache.org>
>> Subject: RE: [users@httpd] 502 proxy error
>>
>> ________________________________
>>
>> From: isha b [mailto:ishaa.b@gmail.com
>> <ma...@gmail.com>]
>> Sent: Thursday, October 30, 2008 12:47 PM
>> To: users@httpd.apache.org <ma...@httpd.apache.org>;
>> users-help@httpd.apache.org <ma...@httpd.apache.org>;
>> users-subscribe@httpd.apache.org
>> <ma...@httpd.apache.org>
>> Subject: [users@httpd] 502 proxy error
>>
>>
>>
>>
>> Team,
>> When I try to access an application using reverse proxy, most of
>> the time I will end up with below error. Anybody have an idea what will
>> be causing the issue? After few refresh on the page I will get actual
>> page but most of the times end up with below proxy error
>>
>>
>>
>> Proxy Error
>> The proxy server received an invalid response from an upstream
>> server.
>> The proxy server could not handle the request GET /testingtool/.
>> Reason: Error reading from remote server
>>
>>
>>
>> ------------------------------------------------------------------------
>> --------
>> Apache/2.2.3 (Fedora) Server at testingserver.test.com
>> <http://testingserver.test.com/> Port 443
>>
>>
>> Thanks,
>> Isha
>>
>>
>> Aoache is the proxy, is it?
>>
>> It could be the back-end server is not working reliably - what happens
>> if you access it drectly?
>>
>> If it seems OK, how long does it take to respond? If it's a slow
>> application it may take longer than apache is prepared to wait (see
>> ProxyTimeout, KeepAlivetimeout)
>>
>> Rgds,
>> Owen Boyle
>> Disclaimer: Any disclaimer attached to this message may be ignored.
>>
>>
>> ---------------------------------------------------------------------
>> The official User-To-User support forum of the Apache HTTP Server
>> Project.
>> See <URL:http://httpd.apache.org/userslist.html> for more info.
>> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>> <ma...@httpd.apache.org>
>> " from the digest: users-digest-unsubscribe@httpd.apache.org
>> <ma...@httpd.apache.org>
>> For additional commands, e-mail: users-help@httpd.apache.org
>> <ma...@httpd.apache.org>
>>
>>
>> ---------------------------------------------------------------------
>> The official User-To-User support forum of the Apache HTTP Server
>> Project.
>> See <URL:http://httpd.apache.org/userslist.html> for more info.
>> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>> <ma...@httpd.apache.org>
>> " from the digest: users-digest-unsubscribe@httpd.apache.org
>> <ma...@httpd.apache.org>
>> For additional commands, e-mail: users-help@httpd.apache.org
>> <ma...@httpd.apache.org>
>>
>>
>> I use to have the same problems. My advice is to forget about keepalive at
> all. This error said that the reverse proxy is unaccessible for proxy . If
> you take a look in the revers proxy error logs , probably you will see
> something like "BAD GATEWAY" entries. On the proxy server I use the same
> version of apache 2.2.10 with
>
> ProxyPass / http://real_server_ip/ disablereuse=On max=1000
> ttl=60 timeout=300
> And
>
> SetEnv force-proxy-request-1.0 1
> SetEnv proxy-nokeepalive 1
> SetEnv proxy-initial-not-pooled 1
>
> Disable keepalive on the proxy an real servers too.
> With this setings everything seems to be in order for me.Give it a try and
> see how it works.
>
> alex
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
Re: [users@httpd] 502 proxy error
Posted by Alexandru David Constantinescu <al...@gmail.com>.
isha b wrote:
> Thank you all,
>
> I have increased with Keep Alive upto 300 sec as well No KeepAlive
> option buyt the reult is still negative. Still it is throwing the below
> error
>
>
> *proxy*: *Error reading from remote server returned* by /..."
> proxy: error reading status line from remote server
>
>
>
>
> Further I read in groups that the httpd 2.2.3 might have some bugs which
> is causing the problem. Hence I have upgraded my apache to httpd 2.2.10
> . Now the performance is better but still around 40% of the time its end
> up with proxy error.
>
> my backend server is on ISS and reverse proxy is on Fedora 6 on httpd 2.2.10
>
>
> Thanks
> Isha
>
>
>
>
>
> On Thu, Oct 30, 2008 at 7:44 PM, Mehta, Anish <amehta@verisign.com
> <ma...@verisign.com>> wrote:
>
> Are you using mod_proxy_ajp and load balancing between backend servers?
> We used to see this error a lot but when we added timeout parameter to
> BalancerMember directive if went away.
>
> You may also want to try this or add the same parameter to ProxyPass
> directive (timeout=300).
>
> Regards,
> AM
>
> -----Original Message-----
> From: Boyle Owen [mailto:Owen.Boyle@six-group.com
> <ma...@six-group.com>]
> Sent: Thursday, October 30, 2008 9:31 AM
> To: users@httpd.apache.org <ma...@httpd.apache.org>
> Subject: RE: [users@httpd] 502 proxy error
>
> ________________________________
>
> From: isha b [mailto:ishaa.b@gmail.com
> <ma...@gmail.com>]
> Sent: Thursday, October 30, 2008 12:47 PM
> To: users@httpd.apache.org <ma...@httpd.apache.org>;
> users-help@httpd.apache.org <ma...@httpd.apache.org>;
> users-subscribe@httpd.apache.org
> <ma...@httpd.apache.org>
> Subject: [users@httpd] 502 proxy error
>
>
>
>
> Team,
> When I try to access an application using reverse proxy, most of
> the time I will end up with below error. Anybody have an idea what will
> be causing the issue? After few refresh on the page I will get actual
> page but most of the times end up with below proxy error
>
>
>
> Proxy Error
> The proxy server received an invalid response from an upstream
> server.
> The proxy server could not handle the request GET /testingtool/.
> Reason: Error reading from remote server
>
>
> ------------------------------------------------------------------------
> --------
> Apache/2.2.3 (Fedora) Server at testingserver.test.com
> <http://testingserver.test.com/> Port 443
>
>
> Thanks,
> Isha
>
>
> Aoache is the proxy, is it?
>
> It could be the back-end server is not working reliably - what happens
> if you access it drectly?
>
> If it seems OK, how long does it take to respond? If it's a slow
> application it may take longer than apache is prepared to wait (see
> ProxyTimeout, KeepAlivetimeout)
>
> Rgds,
> Owen Boyle
> Disclaimer: Any disclaimer attached to this message may be ignored.
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server
> Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> <ma...@httpd.apache.org>
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> <ma...@httpd.apache.org>
> For additional commands, e-mail: users-help@httpd.apache.org
> <ma...@httpd.apache.org>
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server
> Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> <ma...@httpd.apache.org>
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> <ma...@httpd.apache.org>
> For additional commands, e-mail: users-help@httpd.apache.org
> <ma...@httpd.apache.org>
>
>
I use to have the same problems. My advice is to forget about keepalive
at all. This error said that the reverse proxy is unaccessible for proxy
. If you take a look in the revers proxy error logs , probably you will
see something like "BAD GATEWAY" entries. On the proxy server I use the
same version of apache 2.2.10 with
ProxyPass / http://real_server_ip/ disablereuse=On max=1000
ttl=60 timeout=300
And
SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1
SetEnv proxy-initial-not-pooled 1
Disable keepalive on the proxy an real servers too.
With this setings everything seems to be in order for me.Give it a try
and see how it works.
alex
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