diff --git a/ui/src/components/AdminButton.vue b/ui/src/components/AdminButton.vue
index b84149c..80f1846 100644
--- a/ui/src/components/AdminButton.vue
+++ b/ui/src/components/AdminButton.vue
@@ -48,10 +48,16 @@ export default class extends Vue {
     this.modal_visible = false;
     this.$advent22.set_api_auth(username, password);
 
-    this.$advent22.api_get<boolean>("admin/is_admin").then((is_admin) => {
-      this.$emit("update:modelValue", is_admin);
-      this.is_busy = false;
-    });
+    this.$advent22
+      .api_get<boolean>("admin/is_admin")
+      .then((is_admin) => {
+        this.$emit("update:modelValue", is_admin);
+        this.is_busy = false;
+      })
+      .catch((error) => {
+        alert(this.$advent22.format_user_error(error));
+        this.is_busy = false;
+      });
   }
 
   public on_cancel() {
diff --git a/ui/src/components/DoorMapEditor.vue b/ui/src/components/DoorMapEditor.vue
index ce278c2..f7d685f 100644
--- a/ui/src/components/DoorMapEditor.vue
+++ b/ui/src/components/DoorMapEditor.vue
@@ -83,46 +83,58 @@ export default class extends Vue {
   public loading_doors = false;
   public saving_doors = false;
 
-  private load_doors(): Promise<void | DoorsSaved> {
-    return this.$advent22
-      .api_get<DoorsSaved>("admin/doors")
-      .then((data) => {
-        this.doors.length = 0;
+  private load_doors(): Promise<DoorsSaved> {
+    return new Promise<DoorsSaved>((resolve, reject) => {
+      this.$advent22
+        .api_get<DoorsSaved>("admin/doors")
+        .then((data) => {
+          this.doors.length = 0;
 
-        for (const value of data) {
-          this.doors.push(Door.load(value));
-        }
+          for (const value of data) {
+            this.doors.push(Door.load(value));
+          }
 
-        this.is_loaded = true;
-      })
-      .catch(([reason, endpoint]) => alert(`Fehler: ${reason} in ${endpoint}`));
+          this.is_loaded = true;
+          resolve(data);
+        })
+        .catch(([reason, endpoint]) => {
+          alert(`Fehler: ${reason} in ${endpoint}`);
+          reject();
+        });
+    });
   }
 
   private save_doors(): Promise<void> {
-    const data: DoorsSaved = [];
+    return new Promise<void>((resolve, reject) => {
+      const data: DoorsSaved = [];
 
-    for (const door of this.doors) {
-      data.push(door.save());
-    }
+      for (const door of this.doors) {
+        data.push(door.save());
+      }
 
-    return this.$advent22
-      .api_put("admin/doors", data)
-      .catch((reason) => alert(`Fehler: ${reason} in admin/doors`));
+      this.$advent22
+        .api_put("admin/doors", data)
+        .then(resolve)
+        .catch(([reason, endpoint]) => {
+          alert(`Fehler: ${reason} in ${endpoint}`);
+          reject();
+        });
+    });
   }
 
   public on_open(): void {
     this.is_loaded = false;
-    this.load_doors();
+    this.load_doors().catch(() => {});
   }
 
   public on_download() {
     if (confirm("Aktuelle Änderungen verwerfen und Status vom Server laden?")) {
       this.loading_doors = true;
 
-      this.load_doors().then(() => {
-        alert("Erfolgeich!");
-        this.loading_doors = false;
-      });
+      this.load_doors()
+        .then(() => alert("Erfolgeich!"))
+        .catch(() => {})
+        .finally(() => (this.loading_doors = false));
     }
   }
 
@@ -137,12 +149,14 @@ export default class extends Vue {
     if (confirm("Aktuelle Änderungen an den Server schicken?")) {
       this.saving_doors = true;
 
-      this.save_doors().then(() => {
-        this.load_doors().then(() => {
-          alert("Erfolgeich!");
-          this.saving_doors = false;
-        });
-      });
+      this.save_doors()
+        .then(() => {
+          this.load_doors()
+            .then(() => alert("Erfolgeich!"))
+            .catch(() => {})
+            .finally(() => (this.saving_doors = false));
+        })
+        .catch(() => (this.saving_doors = false));
     }
   }
 }
diff --git a/ui/src/components/calendar/CalendarDoor.vue b/ui/src/components/calendar/CalendarDoor.vue
index a453e04..6b94b8f 100644
--- a/ui/src/components/calendar/CalendarDoor.vue
+++ b/ui/src/components/calendar/CalendarDoor.vue
@@ -4,7 +4,6 @@
 
 <script lang="ts">
 import { Door } from "@/lib/door";
-import { AxiosError } from "axios";
 import { Options, Vue } from "vue-class-component";
 
 import SVGRect from "./SVGRect.vue";
@@ -27,25 +26,8 @@ export default class extends Vue {
     this.$advent22
       .api_get_blob(`user/image_${this.door.day}`)
       .then((data) => this.$emit("doorSuccess", this.door.day, data))
-      .catch(([reason]) => {
-        let msg = "Unbekannter Fehler, bitte wiederholen!";
-
-        if (reason instanceof AxiosError) {
-          if (reason.code === "ECONNABORTED") {
-            // API unerreichbar
-            msg = "API antwortet nicht, bitte später wiederholen!";
-          } else if (reason.response !== undefined) {
-            if (reason.response.status === 401) {
-              // 401 UNAUTHORIZED
-              msg = "Netter Versuch :)";
-            } else if (reason.response.status === 422) {
-              // 422 UNPROCESSABLE ENTITY
-              msg = "Türchen ist kaputt, bitte Admin benachrichtigen!";
-            }
-          }
-        }
-
-        this.$emit("doorFailure", msg);
+      .catch((error) => {
+        this.$emit("doorFailure", this.$advent22.format_user_error(error));
       });
   }
 }
diff --git a/ui/src/plugins/advent22.ts b/ui/src/plugins/advent22.ts
index 74d6868..3943c0b 100644
--- a/ui/src/plugins/advent22.ts
+++ b/ui/src/plugins/advent22.ts
@@ -1,4 +1,4 @@
-import axios, { AxiosInstance, ResponseType } from "axios";
+import axios, { AxiosError, AxiosInstance, ResponseType } from "axios";
 import { App, Plugin } from "vue";
 
 export class Advent22 {
@@ -28,6 +28,55 @@ export class Advent22 {
     return `Türchen ${day}`;
   }
 
+  public format_user_error([reason, endpoint]: unknown[]): string {
+    let msg =
+      "Unbekannter Fehler, bitte wiederholen! Besteht das Problem länger, bitte Admin benachrichtigen!";
+    let code = "U";
+    const result = () => `${msg} (Fehlercode: ${code}/${endpoint})`;
+
+    if (!(reason instanceof AxiosError)) return result();
+
+    switch (reason.code) {
+      case "ECONNABORTED":
+        // API unerreichbar
+        msg =
+          "API antwortet nicht, bitte später wiederholen! Besteht das Problem länger, bitte Admin benachrichtigen!";
+        code = "D";
+        break;
+
+      case "ERR_NETWORK":
+        // Netzwerk nicht verbunden
+        msg = "Sieht aus, als sei deine Netzwerkverbindung gestört.";
+        code = "N";
+        break;
+
+      default:
+        if (reason.response === undefined) return result();
+
+        switch (reason.response.status) {
+          case 401:
+            // UNAUTHORIZED
+            msg = "Netter Versuch :)";
+            code = "A";
+            break;
+
+          case 422:
+            // UNPROCESSABLE ENTITY
+            msg = "Funktion ist kaputt, bitte Admin benachrichtigen!";
+            code = "I";
+            break;
+
+          default:
+            // HTTP
+            code = `H${reason.response.status}`;
+            break;
+        }
+        break;
+    }
+
+    return result();
+  }
+
   public set_api_auth(username: string, password: string) {
     this.api_auth = { username: username, password: password };
   }
@@ -78,19 +127,17 @@ export class Advent22 {
 
   public api_get_blob(endpoint: string): Promise<string> {
     return new Promise<string>((resolve, reject) => {
-      this._api_get<Blob>(endpoint, "blob")
-        .then((data: Blob) => {
-          const reader = new FileReader();
-          reader.readAsDataURL(data);
-          reader.onloadend = () => {
-            if (typeof reader.result === "string") {
-              resolve(reader.result);
-            } else {
-              reject(["failed data url", endpoint]);
-            }
-          };
-        })
-        .catch(reject);
+      this._api_get<Blob>(endpoint, "blob").then((data: Blob) => {
+        const reader = new FileReader();
+        reader.readAsDataURL(data);
+        reader.onloadend = () => {
+          if (typeof reader.result === "string") {
+            resolve(reader.result);
+          } else {
+            reject(["failed data url", endpoint]);
+          }
+        };
+      });
     });
   }
 
@@ -99,12 +146,15 @@ export class Advent22 {
       auth: this.api_auth,
     };
 
-    return new Promise<void>((resolve, reject) =>
+    return new Promise<void>((resolve, reject) => {
       this.axios
         .put(this.api_url(endpoint), data, req_config)
         .then(() => resolve())
-        .catch(reject),
-    );
+        .catch((reason) => {
+          console.error(`Failed to query ${endpoint}: ${reason}`);
+          reject([reason, endpoint]);
+        });
+    });
   }
 }