diff --git a/dashboard/src/components/AccessControl.vue b/dashboard/src/components/AccessControl.vue
index 983f05b04..c9bf7cda4 100644
--- a/dashboard/src/components/AccessControl.vue
+++ b/dashboard/src/components/AccessControl.vue
@@ -21,7 +21,7 @@
 
 <script setup>
 
-import { ref, onMounted, defineModel, watch } from 'vue';
+import { ref, onMounted, watch } from 'vue';
 import { FormGroup, Radiobutton, MultiSelect } from 'pankow';
 import UsersModel from '../models/UsersModel.js';
 import GroupsModel from '../models/GroupsModel.js';
diff --git a/dashboard/src/components/AppInstallDialog.vue b/dashboard/src/components/AppInstallDialog.vue
index e2b5ebd04..2d35dc4b2 100644
--- a/dashboard/src/components/AppInstallDialog.vue
+++ b/dashboard/src/components/AppInstallDialog.vue
@@ -19,11 +19,11 @@
           <div class="description" v-html="description"></div>
         </div>
         <div v-else-if="step === STEP.INSTALL">
-          <form @submit="submit()" autocomplete="off">
+          <form @submit.prevent="submit()" autocomplete="off">
             <fieldset :disabled="busy">
               <input style="display: none;" type="submit" :disabled="!formValid" />
 
-              <FormGroup>
+              <FormGroup :class="{ 'has-error': formError.location }">
                 <label for="location">{{ $t('appstore.installDialog.location') }}</label>
                 <div>
                   <TextInput id="location" v-model="location" />
@@ -44,7 +44,7 @@
 
               <!-- TODO upstreamUri for proxyapp -->
 
-              <PortBindings v-model:tcp-ports="tcpPorts" v-model:udp-ports="udpPorts" />
+              <PortBindings v-model:tcp-ports="tcpPorts" v-model:udp-ports="udpPorts" :error="formError"/>
               <AccessControl v-model="accessRestriction"/>
 
               <Button @click="submit" icon="fa-solid fa-circle-down" :disabled="!formValid" :loading="busy">Install {{ manifest.title }}</Button>
@@ -81,6 +81,7 @@ const dashboardModel = DashboardModel.create(API_ORIGIN, localStorage.token);
 
 // reactive
 const busy = ref(false);
+const formError = ref({});
 const app = ref({});
 const manifest = ref({});
 const step = ref(STEP.DETAILS);
@@ -138,7 +139,15 @@ async function submit() {
     return window.location.href = '#/apps';
   }
 
-  console.error('Failed to install:', error);
+  formError.value = {};
+  if (error.status === 'Conflict' && error.message.indexOf('port') !== -1) {
+    const match = error.message.match(/.*port.(.*)/);
+    formError.value.port = match ? parseInt(match[1]) : null;
+  } else if (error.status === 'Conflict' && error.message.indexOf('primary location') !== -1) {
+    formError.value.location = true;
+  } else {
+    console.error('Failed to install:', error);
+  }
 }
 
 onMounted(async () => {
diff --git a/dashboard/src/components/PortBindings.vue b/dashboard/src/components/PortBindings.vue
index b8029eb28..9e6557246 100644
--- a/dashboard/src/components/PortBindings.vue
+++ b/dashboard/src/components/PortBindings.vue
@@ -4,6 +4,7 @@
       <Checkbox :label="port.title" v-model="port.enabled" />
       <small>{{ port.description + '.' + (port.portCount >=1 ? (port.portCount + ' ports. ') : '') }}</small>
       <small v-show="port.readOnly">{{ $t('appstore.installDialog.portReadOnly') }}</small>
+      <small class="has-error" v-show="error.port === port.value">Port already taken</small>
       <NumberInput v-model="port.value" :disabled="!port.enabled" :min="1"/>
       <!-- TODO <p class="text-small text-warning text-bold" ng-show="appInstall.domain.provider === 'cloudflare'">{{ 'appstore.installDialog.cloudflarePortWarning' | tr }} </p> -->
     </FormGroup>
@@ -15,7 +16,7 @@
 import { defineProps, defineEmits } from 'vue';
 import { FormGroup, Checkbox, NumberInput } from 'pankow';
 
-const props = defineProps([ 'tcpPorts', 'udpPorts' ]);
+const props = defineProps([ 'tcpPorts', 'udpPorts', 'error' ]);
 defineEmits([ 'update:tcpPorts', 'update:udpPorts' ]);
 
 // copy value so we can use value as model value