Revisa si hay algo para actualizar respecto de code::blocks o de gbd, igualmente queda claro que el código no tiene nada que ver y el problema esta en tu sistema.

Settings->Compiler and debugger...  Then I selected the "Debugger settings" on the left panel and checked the "Display debugger's log" check box.

Y bueno, como consejo, cómprate un boli, un cuaderno, un buen libro, ¡Y a programar! xD

#include <stdio.h>
 
int main(){
    int *a, b;
    b = 5;
    a = &b;
    printf("El valor es:%d",*a);
    return 0;
}

aviso: GDB: Failed to set controlling terminal: Operación no permitida

UDP protocol is used over Port 1900 because the UDP protocol supports a "broadcast semantics" which allows a single UPnP announcement message to be received and heard by all devices listening on the same sub-network. TCP, being inherently a point-to-point connection-oriented protocol, does not support message broadcasts.
When UPnP devices wish to announce themselves, or "shout out" to find out what other UPnP devices are hanging around on the network, they issue a UDP message aimed at port 1900 of the special IP address [239.255.255.250]. This special "multicast" broadcast address has been set aside for UPnP devices and will be received by all of them listening on UDP port 1900.

netstat -avptn