diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.html b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.html
index 9b0b8837e2..b5b995e4d8 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.html
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.html
@@ -632,6 +632,10 @@
               *ngIf="gatewayConfigGroup.get('thingsboard.checkingDeviceActivity.inactivityTimeoutSeconds').hasError('min')">
               {{ 'gateway.inactivity-timeout-seconds-min' | translate }}
             </mat-error>
+            <mat-error
+              *ngIf="gatewayConfigGroup.get('thingsboard.checkingDeviceActivity.inactivityTimeoutSeconds').hasError('pattern')">
+              {{ 'gateway.inactivity-timeout-seconds-pattern' | translate }}
+            </mat-error>
             <mat-icon matIconSuffix style="cursor:pointer;"
                       matTooltip="{{ 'gateway.hints.inactivity-timeout' | translate }}">info_outlined
             </mat-icon>
@@ -647,6 +651,10 @@
               *ngIf="gatewayConfigGroup.get('thingsboard.checkingDeviceActivity.inactivityCheckPeriodSeconds').hasError('min')">
               {{ 'gateway.inactivity-check-period-seconds-min' | translate }}
             </mat-error>
+            <mat-error
+              *ngIf="gatewayConfigGroup.get('thingsboard.checkingDeviceActivity.inactivityCheckPeriodSeconds').hasError('pattern')">
+              {{ 'gateway.inactivity-check-period-seconds-pattern' | translate }}
+            </mat-error>
             <mat-icon matIconSuffix style="cursor:pointer;"
                       matTooltip="{{ 'gateway.hints.inactivity-period' | translate }}">info_outlined
             </mat-icon>
diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.scss b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.scss
index 23d725bcbf..ad4e6cea00 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.scss
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.scss
@@ -70,6 +70,16 @@
     justify-content: flex-end;
     flex: 1;
   }
+
+  mat-form-field {
+    mat-error {
+      display: none !important;
+    }
+
+    mat-error:first-child {
+      display: block !important;
+    }
+  }
 }
 
 :host ::ng-deep {
diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.ts b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.ts
index ed64c96799..c4e1257e64 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.ts
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-configuration.component.ts
@@ -108,8 +108,8 @@ export class GatewayConfigurationComponent implements OnInit {
         handleDeviceRenaming: [true, []],
         checkingDeviceActivity: this.fb.group({
           checkDeviceInactivity: [false, []],
-          inactivityTimeoutSeconds: [200, [Validators.min(1), Validators.pattern(/^[^.\s]+$/)]],
-          inactivityCheckPeriodSeconds: [500, [Validators.min(1), Validators.pattern(/^[^.\s]+$/)]]
+          inactivityTimeoutSeconds: [200, [Validators.min(1), Validators.pattern(/^-?[0-9]+$/)]],
+          inactivityCheckPeriodSeconds: [500, [Validators.min(1), Validators.pattern(/^-?[0-9]+$/)]]
         }),
         security: this.fb.group({
           type: [SecurityTypes.ACCESS_TOKEN, [Validators.required]],
@@ -187,8 +187,8 @@ export class GatewayConfigurationComponent implements OnInit {
     checkingDeviceActivityGroup.get('checkDeviceInactivity').valueChanges.subscribe(enabled => {
       checkingDeviceActivityGroup.updateValueAndValidity();
       if (enabled) {
-        checkingDeviceActivityGroup.get('inactivityTimeoutSeconds').setValidators([Validators.min(1), Validators.required]);
-        checkingDeviceActivityGroup.get('inactivityCheckPeriodSeconds').setValidators([Validators.min(1), Validators.required]);
+        checkingDeviceActivityGroup.get('inactivityTimeoutSeconds').setValidators([Validators.min(1), Validators.required, Validators.pattern(/^-?[0-9]+$/)]);
+        checkingDeviceActivityGroup.get('inactivityCheckPeriodSeconds').setValidators([Validators.min(1), Validators.required, Validators.pattern(/^-?[0-9]+$/)]);
       } else {
         checkingDeviceActivityGroup.get('inactivityTimeoutSeconds').clearValidators();
         checkingDeviceActivityGroup.get('inactivityCheckPeriodSeconds').clearValidators();
diff --git a/ui-ngx/src/assets/locale/locale.constant-en_US.json b/ui-ngx/src/assets/locale/locale.constant-en_US.json
index bf9c0118ea..dd0e7eece7 100644
--- a/ui-ngx/src/assets/locale/locale.constant-en_US.json
+++ b/ui-ngx/src/assets/locale/locale.constant-en_US.json
@@ -2703,9 +2703,11 @@
         "inactivity-check-period-seconds": "Inactivity check period (in sec)",
         "inactivity-check-period-seconds-required": "Inactivity check period is required",
         "inactivity-check-period-seconds-min": "Inactivity check period can not be less then 1",
+        "inactivity-check-period-seconds-pattern": "Inactivity check period is not valid",
         "inactivity-timeout-seconds": "Inactivity timeout (in sec)",
         "inactivity-timeout-seconds-required": "Inactivity timeout is required",
         "inactivity-timeout-seconds-min": "Inactivity timeout can not be less then 1",
+        "inactivity-timeout-seconds-pattern": "Inactivity timeout is not valid",
         "json-parse": "Not valid JSON.",
         "json-required": "Field cannot be empty.",
         "logs": {