diff --git a/src/App.vue b/src/App.vue
index bd57e681f..eb402a2af 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -30,6 +30,7 @@ import { useNavigationTargets } from "@/composables/useNavigationTargets";
 import { useDataGridActions } from "@/composables/useDataGridActions";
 import { useTauriEvents } from "@/composables/useTauriEvents";
 import "@/i18n";
+import { translateBackendError } from "@/i18n/backend-errors";
 import * as api from "@/lib/api";
 import { resolveDefaultDatabase } from "@/lib/defaultDatabase";
 import { resolveExecutableSql } from "@/lib/sqlExecutionTarget";
@@ -288,7 +289,7 @@ async function newQuery() {
     const options = await getDatabaseOptions(connId);
     queryStore.updateDatabase(tabId, resolveDefaultDatabase(conn, options));
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -302,7 +303,7 @@ async function openConnectionQuery(connectionId: string) {
     const options = await getDatabaseOptions(connectionId);
     queryStore.updateDatabase(tabId, resolveDefaultDatabase(connection, options));
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -339,7 +340,7 @@ async function changeActiveConnection(connectionId: string) {
     const options = await getDatabaseOptions(connectionId);
     queryStore.updateDatabase(tab.id, resolveDefaultDatabase(connection, options));
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -747,7 +748,9 @@ onUnmounted(() => {
           @danger-confirm="onDangerConfirm"
           @connect-started="(name: string) => toast(t('connection.connecting', { name }), 30000)"
           @connect-succeeded="(name: string) => toast(t('connection.connectSuccess', { name }), 2000)"
-          @connect-failed="(msg: string) => toast(t('connection.connectFailed', { message: msg }), 5000)"
+          @connect-failed="
+            (msg: string) => toast(t('connection.connectFailed', { message: translateBackendError(t, msg) }), 5000)
+          "
           @structure-editor-saved="onStructureEditorSaved(onReloadData, toast)"
           @open-lineage-target="openLineageTarget"
           @open-database-search-target="openDatabaseSearchTarget"
diff --git a/src/components/editor/AiAssistant.vue b/src/components/editor/AiAssistant.vue
index 6f87fff58..2585b8079 100644
--- a/src/components/editor/AiAssistant.vue
+++ b/src/components/editor/AiAssistant.vue
@@ -2,6 +2,7 @@
 import { computed, nextTick, onMounted, ref } from "vue";
 import { uuid } from "@/lib/utils";
 import { useI18n } from "vue-i18n";
+import { translateBackendError } from "@/i18n/backend-errors";
 import {
   ArrowUp,
   ArrowRightLeft,
@@ -152,7 +153,7 @@ async function changeConnection(connectionId: string) {
       queryStore.updateDatabase(tab.id, database);
     }
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
diff --git a/src/components/layout/AppSidebar.vue b/src/components/layout/AppSidebar.vue
index 94e6bbd84..afb384cd4 100644
--- a/src/components/layout/AppSidebar.vue
+++ b/src/components/layout/AppSidebar.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref } from "vue";
 import { useI18n } from "vue-i18n";
+import { translateBackendError } from "@/i18n/backend-errors";
 import { Upload, Download, RefreshCw } from "lucide-vue-next";
 import { Button } from "@/components/ui/button";
 import { Tooltip, TooltipTrigger, TooltipContent } from "@/components/ui/tooltip";
@@ -34,7 +35,7 @@ async function refreshTree() {
   try {
     await connectionStore.refreshAllTree();
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
diff --git a/src/components/sidebar/TreeItem.vue b/src/components/sidebar/TreeItem.vue
index 83d3563d0..6c047ed60 100644
--- a/src/components/sidebar/TreeItem.vue
+++ b/src/components/sidebar/TreeItem.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref, computed, watch } from "vue";
 import { useI18n } from "vue-i18n";
+import { translateBackendError } from "@/i18n/backend-errors";
 import {
   Database,
   Table,
@@ -304,7 +305,7 @@ async function toggle() {
     }
   } catch (e: any) {
     if (!wasExpanded) node.isExpanded = false;
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -358,7 +359,7 @@ async function openObjectBrowser() {
       await toggle();
     }
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -460,7 +461,7 @@ async function newQuery() {
     const options = await getDatabaseOptions(node.connectionId);
     queryStore.createTab(node.connectionId, resolveDefaultDatabase(connection, options), undefined, "query");
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
@@ -488,7 +489,7 @@ async function refresh() {
   try {
     await connectionStore.refreshTreeNode(props.node);
   } catch (e: any) {
-    toast(t("connection.connectFailed", { message: e?.message || String(e) }), 5000);
+    toast(t("connection.connectFailed", { message: translateBackendError(t, e?.message || String(e)) }), 5000);
   }
 }
 
diff --git a/src/i18n/backend-errors.ts b/src/i18n/backend-errors.ts
new file mode 100644
index 000000000..45f8e4da5
--- /dev/null
+++ b/src/i18n/backend-errors.ts
@@ -0,0 +1,34 @@
+import type { ComposerTranslation } from "vue-i18n";
+
+const patterns: [RegExp, string][] = [
+  [/^(.+?) driver is not installed\. Please install it from the Driver Manager\.$/, "connection.driverNotInstalled"],
+  [/^JRE (.+?) runtime is not installed\. Please install it from the Driver Manager\.$/, "connection.jreNotInstalled"],
+  [
+    /^System Java runtime was not found on PATH\. Please install Java or choose a custom Java executable\.$/,
+    "connection.systemJavaNotFound",
+  ],
+  [/^Custom Java runtime path is empty\. Please choose a Java executable\.$/, "connection.customJavaPathEmpty"],
+  [
+    /^JDBC plugin is not installed\. Install the optional JDBC plugin to use this connection\.$/,
+    "connection.jdbcPluginNotInstalled",
+  ],
+];
+
+const paramNames: Record<string, string> = {
+  "connection.driverNotInstalled": "driver",
+  "connection.jreNotInstalled": "jre",
+};
+
+export function translateBackendError(t: ComposerTranslation, message: string): string {
+  for (const [regex, key] of patterns) {
+    const match = message.match(regex);
+    if (match) {
+      const name = paramNames[key];
+      if (name && match[1]) {
+        return t(key, { [name]: match[1] });
+      }
+      return t(key);
+    }
+  }
+  return message;
+}
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 77a753e23..714667eb7 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -131,6 +131,12 @@ export default {
     connecting: "Connecting to {name}...",
     connectSuccess: "Connected to {name}",
     connectFailed: "Connection failed: {message}",
+    driverNotInstalled: "{driver} driver is not installed. Please install it from the Driver Manager.",
+    jreNotInstalled: "JRE {jre} runtime is not installed. Please install it from the Driver Manager.",
+    systemJavaNotFound:
+      "System Java runtime was not found on PATH. Please install Java or choose a custom Java executable.",
+    customJavaPathEmpty: "Custom Java runtime path is empty. Please choose a Java executable.",
+    jdbcPluginNotInstalled: "JDBC plugin is not installed. Install the optional JDBC plugin to use this connection.",
     lastError: "Connection error",
     clearError: "Clear connection error",
     saveFailed: "Failed to save connection: {message}",
diff --git a/src/i18n/locales/es.ts b/src/i18n/locales/es.ts
index ba5c12a60..935d8f626 100644
--- a/src/i18n/locales/es.ts
+++ b/src/i18n/locales/es.ts
@@ -131,6 +131,12 @@ export default {
     connecting: "Conectando a {name}...",
     connectSuccess: "Conectado a {name}",
     connectFailed: "Error de conexión: {message}",
+    driverNotInstalled: "El controlador {driver} no está instalado. Instálelo desde el Administrador de controladores.",
+    jreNotInstalled: "El entorno JRE {jre} no está instalado. Instálelo desde el Administrador de controladores.",
+    systemJavaNotFound: "No se encontró Java en el PATH del sistema. Instale Java o elija un ejecutable personalizado.",
+    customJavaPathEmpty: "La ruta de Java personalizada está vacía. Elija un ejecutable de Java.",
+    jdbcPluginNotInstalled:
+      "El plugin JDBC no está instalado. Instale el plugin JDBC opcional para usar esta conexión.",
     lastError: "Error de conexión",
     clearError: "Limpiar error de conexión",
     saveFailed: "Error al guardar la conexión: {message}",
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index d0209a616..d2294a11e 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -130,6 +130,11 @@ export default {
     connecting: "正在连接 {name}...",
     connectSuccess: "已连接 {name}",
     connectFailed: "连接失败：{message}",
+    driverNotInstalled: "{driver} 驱动未安装，请在驱动管理器中安装。",
+    jreNotInstalled: "JRE {jre} 运行环境未安装，请在驱动管理器中安装。",
+    systemJavaNotFound: "未在 PATH 中找到系统 Java 运行环境，请安装 Java 或选择自定义 Java 可执行文件。",
+    customJavaPathEmpty: "自定义 Java 运行环境路径为空，请选择 Java 可执行文件。",
+    jdbcPluginNotInstalled: "JDBC 插件未安装，请先安装 JDBC 插件再使用此连接。",
     lastError: "连接错误",
     clearError: "清除连接错误",
     saveFailed: "保存连接失败：{message}",