Cannot bind TCP socket to local IP

Question

I have my server program binding fine to 0.0.0.0 (INADDR_ANY) or 127.0.0.1 (INADDR_LOOPBACK), however I want the program to listen on my local network IP (192.168.1.24) and I keep getting this error:

Error opening the listening port 8888 (Raw TCP output): Cannot assign requested address

Here is the relevant code:

#define LOCAL_IP ((unsigned long int) 0x1801A8C8) //192.168.1.24
#define PORT 8888

struct sockaddr_in sa;

sa.sin_family = AF_INET;
sa.sin_port = htons(PORT);
sa.sin_addr.s_addr = LOCAL_IP; /* Bind servers to local net*/
//sa.sin_addr.s_addr = htonl(INADDR_ANY);

I've also tried htonl(LOCAL_IP) and inet_addr("192.168.1.24") with no luck.

what OS? do you have a firewall, or similar security running? — James Parsons
Agh it is C0 and not C8!! Thank you, I really should have noticed that mistake. Fixed now! Thanks. — tozhan

robin.koch robin.koch · Accepted Answer · 2014-03-31T12:38:05

The IP you use is: 200.168.1.24

Use:

sa.sin_addr.s_addr = inet_addr("192.168.1.24");

instead.
Make sure the port isn't already in use. (use the program netstat) Have you closed the socket correctly, at tests before?

Cannot bind TCP socket to local IP

2 Answers