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From "isha b" <isha...@gmail.com>
Subject Re: [users@httpd] 502 proxy error
Date Tue, 04 Nov 2008 10:23:35 GMT
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
>>    <mailto:Owen.Boyle@six-group.com>]
>>    Sent: Thursday, October 30, 2008 9:31 AM
>>    To: users@httpd.apache.org <mailto:users@httpd.apache.org>
>>    Subject: RE: [users@httpd] 502 proxy error
>>
>>    ________________________________
>>
>>           From: isha b [mailto:ishaa.b@gmail.com
>>    <mailto:ishaa.b@gmail.com>]
>>           Sent: Thursday, October 30, 2008 12:47 PM
>>           To: users@httpd.apache.org <mailto:users@httpd.apache.org>;
>>    users-help@httpd.apache.org <mailto:users-help@httpd.apache.org>;
>>    users-subscribe@httpd.apache.org
>>    <mailto: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
>>    <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.
>>
>>
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>>
>>
>> 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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