diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index 5ae7b23bf..b5e1a870e 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -139,11 +139,22 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
     if (rc == -1) {
         err = ngx_socket_errno;
 
-        /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
-
-        if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
 
+        if (err != NGX_EINPROGRESS
+#if (NGX_WIN32)
+            /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
+            && err != NGX_EAGAIN
+#endif
+            )
+        {
             if (err == NGX_ECONNREFUSED
+#if (NGX_LINUX)
+                /*
+                 * Linux returns EAGAIN instead of ECONNREFUSED
+                 * for unix sockets if listen queue is full
+                 */
+                || err == NGX_EAGAIN
+#endif
                 || err == NGX_ENETDOWN
                 || err == NGX_ENETUNREACH
                 || err == NGX_EHOSTDOWN