diff --git a/src/iperf.h b/src/iperf.h
index b5405f92d..a4ec08eab 100644
--- a/src/iperf.h
+++ b/src/iperf.h
@@ -432,6 +432,7 @@ extern int gerror; /* error value from getaddrinfo(3), for use in internal error
 /* UDP "connect" message and reply (textual value for Wireshark, etc. readability - legacy was numeric) */
 #define UDP_CONNECT_MSG 0x36373839          // "6789" - legacy value was 123456789
 #define UDP_CONNECT_REPLY 0x39383736        // "9876" - legacy value was 987654321
+#define LEGACY_UDP_CONNECT_MSG 123456789    // Old servers may still reply with the legacy value
 #define LEGACY_UDP_CONNECT_REPLY 987654321  // Old servers may still reply with the legacy value
 
 /* In Reverse mode, maximum number of packets to wait for "accept" response - to handle out of order packets */
diff --git a/src/iperf_udp.c b/src/iperf_udp.c
index b697c9729..350d49551 100644
--- a/src/iperf_udp.c
+++ b/src/iperf_udp.c
@@ -592,9 +592,9 @@ iperf_udp_connect(struct iperf_test *test)
             printf("Connect received for Socket %d, sz=%d, buf=%x, i=%d, max_len_wait_for_reply=%d\n", s, sz, buf, i, max_len_wait_for_reply);
         }
         i += sz;
-    } while (buf != UDP_CONNECT_REPLY && buf != LEGACY_UDP_CONNECT_REPLY && i < max_len_wait_for_reply);
+    } while (buf != UDP_CONNECT_REPLY && buf != LEGACY_UDP_CONNECT_REPLY && buf != UDP_CONNECT_MSG && buf != LEGACY_UDP_CONNECT_MSG && i < max_len_wait_for_reply);
 
-    if (buf != UDP_CONNECT_REPLY  && buf != LEGACY_UDP_CONNECT_REPLY) {
+    if (buf != UDP_CONNECT_REPLY && buf != LEGACY_UDP_CONNECT_REPLY && buf != UDP_CONNECT_MSG && buf != LEGACY_UDP_CONNECT_MSG) {
         i_errno = IESTREAMREAD;
         return -1;
     }