diff --git a/src/ScadaLink.CentralUI/Components/Pages/Deployment/DebugView.razor b/src/ScadaLink.CentralUI/Components/Pages/Deployment/DebugView.razor
index 2cf04d8..7df7140 100644
--- a/src/ScadaLink.CentralUI/Components/Pages/Deployment/DebugView.razor
+++ b/src/ScadaLink.CentralUI/Components/Pages/Deployment/DebugView.razor
@@ -29,7 +29,7 @@
         <div class="row mb-3 g-2">
             <div class="col-md-3">
                 <label class="form-label small">Site</label>
-                <select class="form-select form-select-sm" @bind="_selectedSiteId" @bind:after="LoadInstancesForSite">
+                <select class="form-select form-select-sm" @bind="_selectedSiteId" @bind:after="LoadInstancesForSite" disabled="@_connected">
                     <option value="0">Select site...</option>
                     @foreach (var site in _sites)
                     {
@@ -39,7 +39,7 @@
             </div>
             <div class="col-md-4">
                 <label class="form-label small">Instance</label>
-                <select class="form-select form-select-sm" @bind="_selectedInstanceId" @bind:after="OnInstanceSelectionChanged">
+                <select class="form-select form-select-sm" @bind="_selectedInstanceId" @bind:after="OnInstanceSelectionChanged" disabled="@_connected">
                     <option value="0">Select instance...</option>
                     @foreach (var inst in _siteInstances)
                     {