diff --git a/t/014-bugs.t b/t/014-bugs.t
index f0f9b91841..764f7ceb41 100644
--- a/t/014-bugs.t
+++ b/t/014-bugs.t
@@ -884,7 +884,7 @@ ok
 --- config
     location /t {
         resolver $TEST_NGINX_RESOLVER ipv6=off;
-        set $myhost 'localhost.';
+        set $myhost '127.0.0.1.sslip.io.';
         proxy_pass http://$myhost:$TEST_NGINX_RAND_PORT_1/t;
     }
 --- request
diff --git a/t/024-access/on-abort.t b/t/024-access/on-abort.t
index 70637ba862..a013d90998 100644
--- a/t/024-access/on-abort.t
+++ b/t/024-access/on-abort.t
@@ -372,7 +372,7 @@ delete thread 1
 $
 --- timeout: 0.2
 --- abort
---- wait: 0.2
+--- wait: 1
 --- ignore_response
 --- no_error_log
 [error]
diff --git a/t/058-tcp-socket.t b/t/058-tcp-socket.t
index d2200a4343..efb403490f 100644
--- a/t/058-tcp-socket.t
+++ b/t/058-tcp-socket.t
@@ -210,7 +210,7 @@ attempt to send data on a closed socket:
         content_by_lua '
             local sock = ngx.socket.tcp()
             local port = $TEST_NGINX_SERVER_PORT
-            local ok, err = sock:connect("localhost", port)
+            local ok, err = sock:connect("127.0.0.1.sslip.io", port)
             if not ok then
                 ngx.say("failed to connect: ", err)
                 return
@@ -218,7 +218,7 @@ attempt to send data on a closed socket:
 
             ngx.say("connected: ", ok)
 
-            local req = "GET /foo HTTP/1.0\\r\\nHost: localhost\\r\\nConnection: close\\r\\n\\r\\n"
+            local req = "GET /foo HTTP/1.0\\r\\nHost: 127.0.0.1.sslip.io\\r\\nConnection: close\\r\\n\\r\\n"
             -- req = "OK"
 
             local bytes, err = sock:send(req)
@@ -256,7 +256,7 @@ attempt to send data on a closed socket:
 GET /t
 --- response_body_like
 connected: 1
-request sent: 57
+request sent: 66
 first line received: HTTP\/1\.1 200 OK
 second line received: (?:Date|Server): .*?
 --- no_error_log
diff --git a/t/128-duplex-tcp-socket.t b/t/128-duplex-tcp-socket.t
index 511cc20bfc..268ec79cda 100644
--- a/t/128-duplex-tcp-socket.t
+++ b/t/128-duplex-tcp-socket.t
@@ -355,7 +355,7 @@ F(ngx_http_lua_socket_tcp_finalize_write_part) {
 --- tcp_query_len: 11
 --- no_error_log
 [error]
---- wait: 0.05
+--- wait: 0.5
 
 
 
diff --git a/t/189-http2-subreq-error-wakeup.t b/t/189-http2-subreq-error-wakeup.t
index 2b6adb6e19..553b806b74 100644
--- a/t/189-http2-subreq-error-wakeup.t
+++ b/t/189-http2-subreq-error-wakeup.t
@@ -46,6 +46,7 @@ __DATA__
 --- http2
 --- request
 GET /delay
+--- curl_options: --max-time=0.9
 --- timeout: 1
 --- abort
 --- ignore_response
@@ -100,6 +101,7 @@ Parent request finished, got response from subrequest
 --- http2
 --- request
 GET /outer
+--- curl_options: --max-time=0.9
 --- timeout: 1
 --- abort
 --- ignore_response
@@ -160,6 +162,7 @@ Outer request completed
 --- http2
 --- request
 GET /parallel
+--- curl_options: --max-time=0.9
 --- timeout: 1
 --- abort
 --- ignore_response