diff --git a/server/model/monitor.js b/server/model/monitor.js
index 2ad572e53..37eae782a 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -1189,6 +1189,7 @@ class Monitor extends BeanModel {
             let res;
             if (this.auth_method === "ntlm") {
                 options.httpsAgent.keepAlive = true;
+                options.httpAgent.keepAlive = true;
 
                 res = await httpNtlm(options, {
                     username: this.basic_auth_user,