Index: src/OFTCPSocket.m
==================================================================
--- src/OFTCPSocket.m
+++ src/OFTCPSocket.m
@@ -454,11 +454,11 @@
 		if (response[1] != 0) {
 			int errNo;
 
 			switch (response[1]) {
 			case 0x02:
-				errNo = EACCES;
+				errNo = EPERM;
 				break;
 			case 0x03:
 				errNo = ENETUNREACH;
 				break;
 			case 0x04:
@@ -469,17 +469,21 @@
 				break;
 			case 0x06:
 				errNo = ETIMEDOUT;
 				break;
 			case 0x07:
-				errNo = EPROTONOSUPPORT;
+				errNo = ENOTSUP;
 				break;
 			case 0x08:
 				errNo = EAFNOSUPPORT;
 				break;
 			default:
+#ifdef EPROTO
 				errNo = EPROTO;
+#else
+				errNo = 0;
+#endif
 				break;
 			}
 
 			_exception = [[OFConnectionFailedException alloc]
 			    initWithHost: _host