diff --git a/src/manager.c b/src/manager.c
index eb46b736..d9acc63d 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -83,6 +83,15 @@ setnonblocking(int fd)
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
 
+static void
+destroy_server(struct server *server) {
+// function used to free memories alloced in **get_server**
+    if (server->method) ss_free(server->method);
+    if (server->plugin) ss_free(server->plugin);
+    if (server->plugin_opts) ss_free(server->plugin_opts);
+    if (server->mode) ss_free(server->mode);
+}
+
 static void
 build_config(char *prefix, struct server *server)
 {
@@ -102,6 +111,11 @@ build_config(char *prefix, struct server *server)
     fprintf(f, "{\n");
     fprintf(f, "\"server_port\":\"%s\",\n", server->port);
     fprintf(f, "\"password\":\"%s\",\n", server->password);
+    if (server->fast_open[0]) fprintf(f, "\"fast_open\": %s,\n", server->fast_open);
+    if (server->mode)   fprintf(f, "\"mode\":\"%s\",\n", server->mode);
+    if (server->method) fprintf(f, "\"method\":\"%s\",\n", server->method);
+    if (server->plugin) fprintf(f, "\"plugin\":\"%s\",\n", server->plugin);
+    if (server->plugin_opts) fprintf(f, "\"plugin_opts\":\"%s\",\n", server->plugin_opts);
     fprintf(f, "}\n");
     fclose(f);
     ss_free(path);
@@ -111,14 +125,16 @@ static char *
 construct_command_line(struct manager_ctx *manager, struct server *server)
 {
     static char cmd[BUF_SIZE];
+    char *method = manager->method;
     int i;
 
     build_config(working_dir, server);
 
+    if (server->method) method = server->method;
     memset(cmd, 0, BUF_SIZE);
     snprintf(cmd, BUF_SIZE,
              "%s -m %s --manager-address %s -f %s/.shadowsocks_%s.pid -c %s/.shadowsocks_%s.conf",
-             executable, manager->method, manager->manager_address,
+             executable, method, manager->manager_address,
              working_dir, server->port, working_dir, server->port);
 
     if (manager->acl != NULL) {
@@ -143,15 +159,15 @@ construct_command_line(struct manager_ctx *manager, struct server *server)
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " -v");
     }
-    if (manager->mode == UDP_ONLY) {
+    if (server->mode == NULL && manager->mode == UDP_ONLY) {
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " -U");
     }
-    if (manager->mode == TCP_AND_UDP) {
+    if (server->mode == NULL && manager->mode == TCP_AND_UDP) {
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " -u");
     }
-    if (manager->fast_open) {
+    if (server->fast_open[0] == 0 && manager->fast_open) {
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " --fast-open");
     }
@@ -163,11 +179,11 @@ construct_command_line(struct manager_ctx *manager, struct server *server)
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " --mtu %d", manager->mtu);
     }
-    if (manager->plugin) {
+    if (server->plugin == NULL && manager->plugin) {
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " --plugin \"%s\"", manager->plugin);
     }
-    if (manager->plugin_opts) {
+    if (server->plugin_opts == NULL && manager->plugin_opts) {
         int len = strlen(cmd);
         snprintf(cmd + len, BUF_SIZE - len, " --plugin-opts \"%s\"", manager->plugin_opts);
     }
@@ -264,6 +280,26 @@ get_server(char *buf, int len)
                 if (value->type == json_string) {
                     strncpy(server->password, value->u.string.ptr, 128);
                 }
+            } else if (strcmp(name, "method") == 0) {
+                if (value->type == json_string) {
+                    server->method = strdup(value->u.string.ptr);
+                }
+            } else if (strcmp(name, "fast_open") == 0) {
+                if (value->type == json_boolean) {
+                    strncpy(server->fast_open, (value->u.boolean ? "true" : "false"), 8);
+                }
+            } else if (strcmp(name, "plugin") == 0) {
+                if (value->type == json_string) {
+                    server->plugin = strdup(value->u.string.ptr);
+                }
+            } else if (strcmp(name, "plugin_opts") == 0) {
+                if (value->type == json_string) {
+                    server->plugin_opts = strdup(value->u.string.ptr);
+                }
+            } else if (strcmp(name, "mode") == 0) {
+                if (value->type == json_string) {
+                    server->mode = strdup(value->u.string.ptr);
+                }
             } else {
                 LOGE("invalid data: %s", data);
                 break;
@@ -623,6 +659,7 @@ remove_server(char *prefix, char *port)
     cork_hash_table_delete(server_table, (void *)port, (void **)&old_port, (void **)&old_server);
 
     if (old_server != NULL) {
+        destroy_server(old_server);
         ss_free(old_server);
     }
 
@@ -647,7 +684,7 @@ manager_recv_cb(EV_P_ ev_io *w, int revents)
 {
     struct manager_ctx *manager = (struct manager_ctx *)w;
     socklen_t len;
-    size_t r;
+    ssize_t r;
     struct sockaddr_un claddr;
     char buf[BUF_SIZE];
 
@@ -676,6 +713,7 @@ manager_recv_cb(EV_P_ ev_io *w, int revents)
         if (server == NULL || server->port[0] == 0 || server->password[0] == 0) {
             LOGE("invalid command: %s:%s", buf, get_data(buf, r));
             if (server != NULL) {
+                destroy_server(server);
                 ss_free(server);
             }
             goto ERROR_MSG;
@@ -683,6 +721,8 @@ manager_recv_cb(EV_P_ ev_io *w, int revents)
 
         remove_server(working_dir, server->port);
         int ret = add_server(manager, server);
+        destroy_server(server);
+        ss_free(server);
 
         char *msg;
         int msg_len;
@@ -704,12 +744,14 @@ manager_recv_cb(EV_P_ ev_io *w, int revents)
         if (server == NULL || server->port[0] == 0) {
             LOGE("invalid command: %s:%s", buf, get_data(buf, r));
             if (server != NULL) {
+                destroy_server(server);
                 ss_free(server);
             }
             goto ERROR_MSG;
         }
 
         remove_server(working_dir, server->port);
+        destroy_server(server);
         ss_free(server);
 
         char msg[3] = "ok";
diff --git a/src/manager.h b/src/manager.h
index fc0ee012..6fad5542 100644
--- a/src/manager.h
+++ b/src/manager.h
@@ -67,6 +67,11 @@ struct manager_ctx {
 struct server {
     char port[8];
     char password[128];
+    char fast_open[8];
+    char *mode;
+    char *method;
+    char *plugin;
+    char *plugin_opts;
     uint64_t traffic;
 };