iOS check non-default open ports - ios

Question

Trying to implement a JB check for non-default open ports (i.e., 22/TCP SSH):
/**
Checks for non-standard ports
*/
inline int isPortOpen(short port)__attribute__((always_inline));
-(BOOL)isPortOpen:(short) port
{
struct sockaddr_in addr;
int sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if(inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr)) {
int result = connect(sock,(struct sockaddr *)&addr, sizeof(addr));
// error :(
int w00t = errno;
NSLog(#"Error: %i",w00t);
if(result == 0){
NSLog(#"FAILED JB CHECK -- non-standard port open!");
return YES;
}
close(sock);
}
NSLog(#"PASSED JB CHECK -- non-standard ports closed.");
return NO;
}
But connect() fails (result is -1) and the errno is 1 -- EPERM
https://developer.apple.com/library/ios/documentation/System/Conceptual/ManPages_iPhoneOS/man2/intro.2.html
1 EPERM Operation not permitted. An attempt was made to perform an operation
limited to processes with appropriate privileges or to the
owner of a file or other resources.
Looking at the manual for connect(), EPERM is not one of the possible return errors.
https://developer.apple.com/library/ios/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
So, the only reason I can see for getting EPERM is the sandbox, but:
Running on a jailbroken iPod (iOS 8.4)
The container seatbelt profile allows outbound network connections by default
I'd like to understand what's happening. Note that I've tried connecting to the wireless interface as well, instead of loopback.