# Problem with communication between Ignition and PLCs S71200 **URL:** \ **Category:** General Discussion\ **Created:** [August 11, 2016, 9:16am UTC](https://forum.inductiveautomation.com/t/problem-with-communication-between-ignition-and-plcs-s71200/12027 "2016-08-11T09:16:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![P11](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@P11](https://forum.inductiveautomation.com/u/P11)\ **Post date:** [August 11, 2016, 9:16am UTC](https://forum.inductiveautomation.com/t/problem-with-communication-between-ignition-and-plcs-s71200/12027/1 "2016-08-11T09:16:02Z")
Good morning from Italy, I have the following problems with Siemens S7 1200. I have success in connecting some devices, using the following address type : 192.168.1.XX, with XX that is a number which varies with the device. I have NOT success connecting devices using 192.168.8.XX. I suppose the problem is with port 8. Do you have some ideas about solving this problem ? Thank you in advance for the answer. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [August 11, 2016, 1:31pm UTC](https://forum.inductiveautomation.com/t/problem-with-communication-between-ignition-and-plcs-s71200/12027/2 "2016-08-11T13:31:28Z")
Can you ping the 192.168.8.XX addresses from the server that is running the Ignition gateway? ---
**Author:** ![P11](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@P11](https://forum.inductiveautomation.com/u/P11)\ **Post date:** [August 11, 2016, 3:24pm UTC](https://forum.inductiveautomation.com/t/problem-with-communication-between-ignition-and-plcs-s71200/12027/3 "2016-08-11T15:24:26Z")
yes I can ping some of them, unfortunately not all