Disable changing TLS if STS is enforced

client/components/NetworkForm.vue

@@ -65,10 +65,18 @@
 								type="checkbox"
 								name="tls"
 								:checked="defaults.tls ? true : false"
-								:disabled="config.lockNetwork ? true : false"
+								:disabled="
+									config.lockNetwork || defaults.hasSTSPolicy ? true : false
+								"
 								@change="onSecureChanged"
 							/>
 							Use secure connection (TLS)
+							<span
+								v-if="defaults.hasSTSPolicy"
+								class="tooltipped tooltipped-n tooltipped-no-delay"
+								aria-label="This network has a strict transport security policy, you will be unable to disable TLS"
+								>🔒 STS</span
+							>
 						</label>
 						<label class="tls">
 							<input

src/models/network.js

@@ -396,7 +396,11 @@ Network.prototype.exportForEdit = function() {
 		fieldsToReturn = ["name", "nick", "username", "password", "realname"];
 	}
 
-	return _.pick(this, fieldsToReturn);
+	const data = _.pick(this, fieldsToReturn);
+
+	data.hasSTSPolicy = !!STSPolicies.get(this.host);
+
+	return data;
 };
 
 Network.prototype.export = function() {