Problem description: according to "TCP/IP network programming" the first chapter gives an example of the
In a computer inside a VMware virtual machine installed Ubuntu programs are as follows:
Hello_server. C

 # include & lt; stdio.h> 
#include  
#include  
#include  
#include  
#include  

Void error_handling (char * message); 

Int main (int arg c, char * argv []) 
{
Int serv_sock; 
Int clnt_sock; 

Struct sockaddr_in serv_addr. 
Struct sockaddr_in clnt_addr; 
Socklen_t clnt_addr_size; 

Char message []="Hello World!" ; 

If (arg c!=2) {
Usage: printf (" % s & lt; Port> \ n ", argv [0]); 
exit(1); 
} 

Serv_sock=socket (PF_INET SOCK_STREAM, 0). 
If (serv_sock==1) 
Error_handling (" socket () error "); 

Memset (& amp; Serv_addr, 0, sizeof (serv_addr)); 
Serv_addr. Sin_family=AF_INET; 
Serv_addr. The sin_addr. S_addr=htonl (INADDR_ANY); 
Serv_addr. Sin_port=htons (atoi (argv [1])); 

If (bind (serv_sock, (struct sockaddr *) & amp; Serv_addr, sizeof (serv_addr))==1) 
Error_handling (" bind () error "); 

If (listen (serv_sock, 5)==1) 
Error_handling (" listen () error "); 

Clnt_addr_size=sizeof (clnt_addr); 
Clnt_sock=accept (serv_sock, (struct sockaddr *) & amp; Clnt_addr, & amp; Clnt_addr_size); 
If (clnt_sock==1) 
Error_handling (" the accept () error "); 

Write (clnt_sock, message, sizeof (the message)); 
Close (clnt_sock); 
Close (serv_sock); 
return 0; 
} 

Void error_handling (char * message) 
{
The fputs (message, stderr); 
Fputc (' \ n 'stderr); 
exit(1); 
} 

Then compile

 GCC hello_server. C - o hserver 

Start the server program

./hserver 9190 

Now in a computer to write the client program
Hello_client. C

 # include & lt; stdio.h> 
#include  
#include  
#include  
#include  
#include  

Void error_handling (char * message); 

Int main (int arg c, char * argv []) 
{
Int the sock; 
Struct sockaddr_in serv_addr. 
Char message [30]. 
Int str_len; 

If (arg c! {
=3)Usage: printf (" % s & lt; IP> & lt; Port> \ n ", argv [0]); 
exit(1); 
} 

The sock=socket (PF_INET SOCK_STREAM, 0). 
If (the sock==1) 
Error_handling (" socket () error "); 

Memset (& amp; Serv_addr, 0, sizeof (serv_addr)); 
Serv_addr. Sin_family=AF_INET; 
Serv_addr. The sin_addr. S_addr=inet_addr (argv [1]). 
Serv_addr. Sin_port=htons (atoi (argv [2])); 

If (connect (the sock, (struct sockaddr *) & amp; Serv_addr, sizeof (serv_addr))==1) 
Error_handling (" the connect () error!" ); 

Str_len=read (the sock, message, sizeof (message) - 1); 
If (str_len==1) 
Error_handling (" the read () error!" ); 

Printf (" the Message from the server: % s \ n ", Message); 
Close (sock); 
return 0; 
} 

Void error_handling (char * message) 
{
The fputs (message, stderr); 
Fputc (' \ n 'stderr); 
exit(1); 
} 

Compiler

 GCC hello_client. C - o hclient 

Run the client program

./hclient computer 1 IP address 9190 

Could not connect the server program, under the same computer can run successfully, you the problem of the virtual machine network configuration