RTC not connected from windows client in NAV 2013 R2

Hi all,

i have installed NAV 2013 R2 in the server and the RTC and everything works fine in the server. but when i try to connect the NAV RTC from windows client from other PC i couldnt connect it.it says “CONNECTION COULDNOT BE CREATED WITH THE SERVER.” but shocking thing is i can acces the web client easily with the same authentication and same instance, ip address of the server. I couldnt find the solution.