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From André Warnier>
Subject Re: Issues with getRemoteAddress
Date Fri, 27 May 2011 09:20:16 GMT
Filippo Machi wrote:
> we're using tomcat 7.0.12

>> 1) You have serverA running Tomcat, and Tomcat listens on port 8080.
>> The (network) IP address of serverA is : ........
> 85.214.x.x
> (apart from the loopback address
>> This Tomcat has some IP-based access Valve which :
> we have a filter, not a valve,  (a class implementing javax.servlet.Filter)
> that authenticates incoming request
> according to:
> - a particular key contained as parameter in the request
> - the ip of the incoming request
> - a cookie
> those checks are applied in the exact order I listed them, if all of them
> fails, then the user
> is redirected to the login page as follows
> request.getServletContext()
>                .getRequestDispatcher(LOGIN_PAGE_REDIRECT_URL)
>                .forward(request, response);
> I don't know whether it matters but we have a chain of filters and the
> authorization one I described is applied
> after a filter that, in some cases perform a forward
> request.getServletContext().getRequestDispatcher(remappedResource).forward(request,
> response);
> but I think it shouldn't be the cause of the issue...
> - for requests from, allows them through without authentication
>> - for requests /not/ from, requires authentication in the form of
>> a cookie, and if that cookie is not present, returns a login page.
>> The requester IP address is obtained by the Valve using the
>> getRemoteAddress() method.
>> 2) On the same serverA, there is a cron job which runs from time to time.
>> This cron job runs a PHP script, which
>> - connects to ""
>> - sends a HTTP request over that connection, directed to a specific Tomcat
>> application
>> - receives a response from Tomcat
>> 3) there are also other clients (not on serverA), which access other
>> applications (or the same application) on serverA/Tomcat directly, by
>> addressing their requests to ?
>> (IP or name).
> there are other clients (browsers) accessing serverA using the server name
>> (it cannot be, since these clients are not on serverA)
>> The IP's of those clients are :
> something like 93.35.x.x
>> And what you are seeing in the logs, is that from time to time, a request
>> which seems to come from the PHP script (and should thus have a client IP
>> address of and go through without authentication), instead seems
>> to come from another IP (and thus is caught by the Valve and returns a login
>> page).
>> And you also see this in the log of the PHP script : it shows that it
>> receives a login page, instead of the expected response. (*)
> Yes, that's exactely what we're experiencing (the only detail that differs
> it's that authentication is performed by a filter, not a valve)
>> One more question : this IP-filter Valve, is that something written
>> in-house ?
> Yes, we coded the filter.
I do not see anything particularly wrong in the server.xml which you sent.
But it does confirm that you have a single <Host> in Tomcat.

One additional question :
The crontab PHP script sends a request to Tomcat from time to time.
Is that request directed to a specific application that only the PHP script is using, or 
is that same application also used by other clients ?

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