diff --git a/src/openvpn/socks.c b/src/openvpn/socks.c
index 078b4e1..5cb5912 100644
--- a/src/openvpn/socks.c
+++ b/src/openvpn/socks.c
@@ -412,8 +412,7 @@
             send(ctrl_sd, "\x05\x03\x00\x01\x00\x00\x00\x00\x00\x00", 10, MSG_NOSIGNAL);
         if (size != 10)
         {
-            msg(D_LINK_ERRORS | M_ERRNO,
-                "establish_socks_proxy_passthru: TCP port write failed on send()");
+            msg(D_LINK_ERRORS | M_ERRNO, "%s: TCP port write failed on send()", __func__);
             goto error;
         }
     }
@@ -424,6 +423,11 @@
     {
         goto error;
     }
+    if (!relay_addr->addr.in4.sin_addr.s_addr)
+    {
+        msg(D_LINK_ERRORS, "%s: Socks proxy did not answer with IPv4 address", __func__);
+        goto error;
+    }
 
     return;