diff --git a/public/assets/pages/viewerpage/application_form.css b/public/assets/pages/viewerpage/application_form.css
index 30c896af..c83c9a1a 100644
--- a/public/assets/pages/viewerpage/application_form.css
+++ b/public/assets/pages/viewerpage/application_form.css
@@ -63,12 +63,15 @@
 }
 
 .component_formviewer .formbuilder .component_input[disabled],
+.component_formviewer .formbuilder .component_input[readonly],
 .component_formviewer .formbuilder .component_textarea[disabled],
-.component_formviewer .formbuilder .component_select[disabled] {
+.component_formviewer .formbuilder .component_textarea[readonly],
+.component_formviewer .formbuilder .component_select[disabled],
+.component_formviewer .formbuilder .component_select[readonly] {
     background: rgba(0, 0, 0, 0.05);
     border-radius: 2px;
     padding-left: 7px;
-    border-color: rgba(0, 0, 0, 0.02);
+    border-color: transparent;
 }
 
 .component_formviewer fieldset {
diff --git a/public/assets/pages/viewerpage/application_form.js b/public/assets/pages/viewerpage/application_form.js
index 1b439e69..d5c91e3e 100644
--- a/public/assets/pages/viewerpage/application_form.js
+++ b/public/assets/pages/viewerpage/application_form.js
@@ -4,7 +4,7 @@ import { animate, slideXIn, opacityOut } from "../../lib/animate.js";
 import { qs, qsa, safe } from "../../lib/dom.js";
 import { loadCSS } from "../../helpers/loader.js";
 import { createForm, mutateForm } from "../../lib/form.js";
-import { formTmpl } from "../../components/form.js";
+import { formTmpl, $renderInput } from "../../components/form.js";
 import { createLoader } from "../../components/loader.js";
 import ctrlError from "../ctrl_error.js";
 
@@ -56,6 +56,14 @@ export default function(render, { acl$, getFilename, getDownloadUrl }) {
             return formSpec;
         }))),
         rxjs.mergeMap((formSpec) => rxjs.from(createForm(formSpec, formTmpl({
+            renderInput: (opts) => {
+                let $el = $renderInput({ autocomplete: true })(opts);
+                if ($el.hasAttribute("disabled")) {
+                    $el.removeAttribute("disabled");
+                    $el.setAttribute("readonly", "true");
+                }
+                return $el;
+            },
             renderLeaf: ({ label, format, description, required }) => createElement(`
                 <label class="no-select">
                     <div>
diff --git a/server/plugin/plg_backend_psql/index.go b/server/plugin/plg_backend_psql/index.go
index 100d9609..eb6f10e3 100644
--- a/server/plugin/plg_backend_psql/index.go
+++ b/server/plugin/plg_backend_psql/index.go
@@ -31,8 +31,11 @@ func init() {
 func (this PSQL) Init(params map[string]string, app *App) (IBackend, error) {
 	if d := PGCache.Get(params); d != nil {
 		backend := d.(*PSQL)
-		backend.ctx = app.Context
-		return backend, nil
+		if backend.db.Ping() == nil {
+			backend.ctx = app.Context
+			return backend, nil
+		}
+		PGCache.Del(params)
 	}
 	host := params["host"]
 	port := withDefault(params["port"], "5432")