diff --git a/server/model/monitor.js b/server/model/monitor.js
index f28b4fe23..ecdece997 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -792,29 +792,19 @@ class Monitor extends BeanModel {
                         port = this.port;
                     }
 
-                    try {
-                        const resp = await radius(
-                            this.hostname,
-                            this.radiusUsername,
-                            this.radiusPassword,
-                            this.radiusCalledStationId,
-                            this.radiusCallingStationId,
-                            this.radiusSecret,
-                            port,
-                            this.interval * 1000 * 0.8,
-                        );
-                        if (resp.code) {
-                            bean.msg = resp.code;
-                        }
-                        bean.status = UP;
-                    } catch (error) {
-                        bean.status = DOWN;
-                        if (error.response?.code) {
-                            bean.msg = error.response.code;
-                        } else {
-                            bean.msg = error.message;
-                        }
-                    }
+                    const resp = await radius(
+                        this.hostname,
+                        this.radiusUsername,
+                        this.radiusPassword,
+                        this.radiusCalledStationId,
+                        this.radiusCallingStationId,
+                        this.radiusSecret,
+                        port,
+                        this.interval * 1000 * 0.4,
+                    );
+
+                    bean.msg = resp.code;
+                    bean.status = UP;
                     bean.ping = dayjs().valueOf() - startTime;
                 } else if (this.type === "redis") {
                     let startTime = dayjs().valueOf();
diff --git a/server/util-server.js b/server/util-server.js
index 031d8b672..ece0456de 100644
--- a/server/util-server.js
+++ b/server/util-server.js
@@ -486,6 +486,7 @@ exports.radius = function (
         host: hostname,
         hostPort: port,
         timeout: timeout,
+        retries: 1,
         dictionaries: [ file ],
     });
 
@@ -497,6 +498,12 @@ exports.radius = function (
             [ attributes.CALLING_STATION_ID, callingStationId ],
             [ attributes.CALLED_STATION_ID, calledStationId ],
         ],
+    }).catch((error) => {
+        if (error.response?.code) {
+            throw Error(error.response.code);
+        } else {
+            throw Error(error.message);
+        }
     });
 };
 
diff --git a/test/test-radius.dockerfile b/test/test-radius.dockerfile
new file mode 100644
index 000000000..3f577edeb
--- /dev/null
+++ b/test/test-radius.dockerfile
@@ -0,0 +1,13 @@
+# Container running a test radius server
+# More instructions in https://github.com/louislam/uptime-kuma/pull/1635
+
+FROM freeradius/freeradius-server:latest
+
+RUN mkdir -p /etc/raddb/mods-config/files/
+
+RUN echo "client net {"                 > /etc/raddb/clients.conf
+RUN echo "    ipaddr = 172.17.0.0/16"  >> /etc/raddb/clients.conf
+RUN echo "    secret = testing123"     >> /etc/raddb/clients.conf
+RUN echo "}"                           >> /etc/raddb/clients.conf
+
+RUN echo "bob Cleartext-Password := \"testpw\"" > /etc/raddb/mods-config/files/authorize