diff --git a/ui/src/components/DoorMapEditor.vue b/ui/src/components/DoorMapEditor.vue
index 2dffa34..4186c64 100644
--- a/ui/src/components/DoorMapEditor.vue
+++ b/ui/src/components/DoorMapEditor.vue
@@ -76,7 +76,7 @@ export default class extends Vue {
   public doors: Door[] = [];
 
   private load_doors(): Promise<void | DoorsSaved> {
-    return this.$advent22.api_get<DoorsSaved>("/general/doors").then((data) => {
+    return this.$advent22.api_get<DoorsSaved>("general/doors").then((data) => {
       this.doors.length = 0;
 
       for (const value of data) {
@@ -96,18 +96,22 @@ export default class extends Vue {
       data.push(door.save());
     }
 
-    return this.$advent22.api_put("/general/doors", data);
+    return this.$advent22.api_put("general/doors", data);
   }
 
   public mounted(): void {
-    this.load_doors().catch((reason) => alert(`Fehler: ${reason}`));
+    this.load_doors().catch(([reason, endpoint]) => {
+      alert(`Fehler: ${reason} in ${endpoint}`);
+    });
   }
 
   public on_download() {
     if (confirm("Aktuelle Änderungen verwerfen und Status vom Server laden?")) {
       this.load_doors()
         .then(() => alert("Erfolgeich!"))
-        .catch((reason) => alert(`Fehler: ${reason}`));
+        .catch(([reason, endpoint]) => {
+          alert(`Fehler: ${reason} in ${endpoint}`);
+        });
     }
   }
 
@@ -121,7 +125,13 @@ export default class extends Vue {
   public on_upload() {
     if (confirm("Aktuelle Änderungen an den Server schicken?")) {
       this.save_doors()
-        .then(() => alert("Erfolgeich!"))
+        .then(() => {
+          this.load_doors()
+            .then(() => alert("Erfolgeich!"))
+            .catch(([reason, endpoint]) =>
+              alert(`Fehler: ${reason} in ${endpoint}`),
+            );
+        })
         .catch((reason) => alert(`Fehler: ${reason}`));
     }
   }
diff --git a/ui/src/components/calendar/CalendarDoor.vue b/ui/src/components/calendar/CalendarDoor.vue
index ac02604..cf4a803 100644
--- a/ui/src/components/calendar/CalendarDoor.vue
+++ b/ui/src/components/calendar/CalendarDoor.vue
@@ -30,12 +30,19 @@ export default class extends Vue {
       .catch(([reason]) => {
         let msg = "Unbekannter Fehler, bitte wiederholen!";
 
-        if (
-          reason instanceof AxiosError &&
-          reason.response !== undefined &&
-          reason.response.status === 401
-        ) {
-          msg = "Netter Versuch :)";
+        if (reason instanceof AxiosError) {
+          if (reason.code === "ECONNABORTED") {
+            // API unerreichbar
+            msg = "API antwortet nicht, bitte später wiederholen!";
+          } else if (reason.response !== undefined) {
+            if (reason.response.status === 401) {
+              // 401 UNAUTHORIZED
+              msg = "Netter Versuch :)";
+            } else if (reason.response.status === 422) {
+              // 422 UNPROCESSABLE ENTITY
+              msg = "Türchen ist kaputt, bitte Admin benachrichtigen!";
+            }
+          }
         }
 
         this.$emit("doorFailure", msg);
diff --git a/ui/src/plugins/advent22.ts b/ui/src/plugins/advent22.ts
index 72db94a..9895655 100644
--- a/ui/src/plugins/advent22.ts
+++ b/ui/src/plugins/advent22.ts
@@ -78,7 +78,7 @@ export class Advent22 {
             if (typeof reader.result === "string") {
               resolve(reader.result);
             } else {
-              reject([endpoint, "failed data url"]);
+              reject(["failed data url", endpoint]);
             }
           };
         })