Problem wih UDP connections

[Gonzalo Cao]

Hi all, I've got an strange problem with UDP communication which I can't explain. First of all let's explain the situation: We have some access control terminals that store the movements of the staff, this devices are connected via ethernet and send this movements through port 4370, using UDP. To link with these devices we have an application that can be installed as a service which periodically downloads the data from them and inserts the data into the database, besides that we have an application for the end user that links to the database and in case of need is able to link with the devices as well. At first we installed both applications in a Windows XP machine and it worked perfectly fine, but after sometime we decided to move the first application to a server and this is when trouble showed up; for some reason it seems the application is unable to connect with any of the devices, but all of them are reachable via ping, telnet and web. And to make things worse I installed the end user application in this server and it connects without any problem. I don't know if this is the right place to post these, but if anyone can give me some tip I'd be most grateful. Best regards.