diff --git a/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.module.scss b/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.module.scss
deleted file mode 100644
index cc122d07f..000000000
--- a/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.module.scss
+++ /dev/null
@@ -1,5 +0,0 @@
-@use '@/scss/underscore' as _;
-
-.senderTest {
-  margin-top: _.unit(6);
-}
diff --git a/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.tsx b/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.tsx
index 03cc0a870..96d49c214 100644
--- a/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.tsx
+++ b/packages/console/src/pages/ConnectorDetails/components/ConnectorContent.tsx
@@ -19,7 +19,6 @@ import { initFormData, parseFormConfig } from '@/pages/Connectors/components/Con
 import type { ConnectorFormType } from '@/pages/Connectors/types';
 import { SyncProfileMode } from '@/pages/Connectors/types';
 
-import * as styles from './ConnectorContent.module.scss';
 import SenderTester from './SenderTester';
 
 type Props = {
@@ -136,7 +135,6 @@ const ConnectorContent = ({ isDeleted, connectorData, onConnectorUpdated }: Prop
         {connectorData.type !== ConnectorType.Social && (
           <FormCard title="connector_details.test_connection">
             <SenderTester
-              className={styles.senderTest}
               connectorId={connectorData.id}
               connectorType={connectorData.type}
               config={watch('config')}
diff --git a/packages/console/src/pages/ConnectorDetails/components/SenderTester/index.tsx b/packages/console/src/pages/ConnectorDetails/components/SenderTester/index.tsx
index 3ca599c38..66b46db8c 100644
--- a/packages/console/src/pages/ConnectorDetails/components/SenderTester/index.tsx
+++ b/packages/console/src/pages/ConnectorDetails/components/SenderTester/index.tsx
@@ -69,9 +69,12 @@ const SenderTester = ({ connectorId, connectorType, config, className }: Props)
 
     const data = { config: result.data, ...(isSms ? { phone: sendTo } : { email: sendTo }) };
 
-    await api.post(`api/connectors/${connectorId}/test`, { json: data }).json();
-
-    setShowTooltip(true);
+    try {
+      await api.post(`api/connectors/${connectorId}/test`, { json: data }).json();
+      setShowTooltip(true);
+    } catch (error: unknown) {
+      console.error(error);
+    }
   });
 
   return (
diff --git a/packages/core/src/errors/RequestError/index.ts b/packages/core/src/errors/RequestError/index.ts
index d1373566b..48807f596 100644
--- a/packages/core/src/errors/RequestError/index.ts
+++ b/packages/core/src/errors/RequestError/index.ts
@@ -15,6 +15,7 @@ const formatZodError = ({ issues }: ZodError): string[] =>
 
     return base + issue.message;
   });
+
 export default class RequestError extends Error {
   code: LogtoErrorCode;
   status: number;
diff --git a/packages/core/src/middleware/koa-connector-error-handler.test.ts b/packages/core/src/middleware/koa-connector-error-handler.test.ts
index aa425465d..cec0e796a 100644
--- a/packages/core/src/middleware/koa-connector-error-handler.test.ts
+++ b/packages/core/src/middleware/koa-connector-error-handler.test.ts
@@ -108,7 +108,7 @@ describe('koaConnectorErrorHandler middleware', () => {
       new RequestError(
         {
           code: 'connector.template_not_found',
-          status: 500,
+          status: 400,
         },
         { message }
       )
@@ -198,7 +198,7 @@ describe('koaConnectorErrorHandler middleware', () => {
       new RequestError(
         {
           code: 'connector.general',
-          status: 500,
+          status: 400,
         },
         { message }
       )
@@ -216,7 +216,7 @@ describe('koaConnectorErrorHandler middleware', () => {
       new RequestError(
         {
           code: 'connector.general',
-          status: 500,
+          status: 400,
           errorDescription: '\nMock General connector errors',
         },
         message
diff --git a/packages/core/src/middleware/koa-connector-error-handler.ts b/packages/core/src/middleware/koa-connector-error-handler.ts
index 44aa7eb80..311e9b239 100644
--- a/packages/core/src/middleware/koa-connector-error-handler.ts
+++ b/packages/core/src/middleware/koa-connector-error-handler.ts
@@ -1,5 +1,5 @@
 import { ConnectorError, ConnectorErrorCodes } from '@logto/connector-kit';
-import { conditional } from '@silverhand/essentials';
+import { trySafe } from '@silverhand/essentials';
 import type { Middleware } from 'koa';
 import { z } from 'zod';
 
@@ -8,7 +8,7 @@ import RequestError from '#src/errors/RequestError/index.js';
 export default function koaConnectorErrorHandler<StateT, ContextT>(): Middleware<StateT, ContextT> {
   // Too many error types :-)
   // eslint-disable-next-line complexity
-  return async (ctx, next) => {
+  return async (_, next) => {
     try {
       await next();
     } catch (error: unknown) {
@@ -19,8 +19,7 @@ export default function koaConnectorErrorHandler<StateT, ContextT>(): Middleware
       const { code, data } = error;
 
       const errorDescriptionGuard = z.object({ errorDescription: z.string() });
-      const result = errorDescriptionGuard.safeParse(data);
-      const errorMessage = conditional(result.success && '\n' + result.data.errorDescription);
+      const message = trySafe(() => errorDescriptionGuard.parse(data))?.errorDescription;
 
       switch (code) {
         case ConnectorErrorCodes.InvalidMetadata:
@@ -43,7 +42,7 @@ export default function koaConnectorErrorHandler<StateT, ContextT>(): Middleware
           throw new RequestError(
             {
               code: `connector.${code}`,
-              status: 500,
+              status: 400,
             },
             data
           );
@@ -57,8 +56,8 @@ export default function koaConnectorErrorHandler<StateT, ContextT>(): Middleware
           throw new RequestError(
             {
               code: `connector.${code}`,
-              status: 500,
-              errorDescription: errorMessage,
+              status: 400, // Temporarily use 400 to avoid false positives. May update later.
+              errorDescription: message,
             },
             data
           );
diff --git a/packages/phrases/src/locales/de/errors.ts b/packages/phrases/src/locales/de/errors.ts
index 616ec431c..f7ecfa933 100644
--- a/packages/phrases/src/locales/de/errors.ts
+++ b/packages/phrases/src/locales/de/errors.ts
@@ -98,7 +98,7 @@ const errors = {
   },
   connector: {
     // UNTRANSLATED
-    general: 'An unexpected error occurred in connector.{{errorDescription}}',
+    general: 'Error occurred in connector: {{errorDescription}}',
     not_found: 'Cannot find any available connector for type: {{type}}.',
     not_enabled: 'The connector is not enabled.',
     invalid_metadata: "The connector's metadata is invalid.",
diff --git a/packages/phrases/src/locales/de/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/de/translation/admin-console/connector-details.ts
index c2c0fe29d..fd12a35d1 100644
--- a/packages/phrases/src/locales/de/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/de/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: 'Teste den SMS Connector',
   test_email_placeholder: 'Gib eine Test-E-Mail ein',
   test_sms_placeholder: 'Gib eine Test-Telefonnummer ein',
-  test_message_sent: 'Testnachricht wurde gesendet!',
-  test_sender_description: 'Wenn dein JSON richtig konfiguriert ist, erhältst du eine Nachricht.',
+  test_message_sent: 'Testnachricht wurde gesendet',
+  test_sender_description:
+    'Logto verwendet die "Generic"-Vorlage zum Testen. Du erhältst eine Nachricht, wenn dein Connector richtig konfiguriert ist.',
   options_change_email: 'E-Mail Connector bearbeiten',
   options_change_sms: 'SMS Connector bearbeiten',
   connector_deleted: 'Der Connector wurde erfolgreich gelöscht',
diff --git a/packages/phrases/src/locales/en/errors.ts b/packages/phrases/src/locales/en/errors.ts
index 2f0e3c107..7ca1065c5 100644
--- a/packages/phrases/src/locales/en/errors.ts
+++ b/packages/phrases/src/locales/en/errors.ts
@@ -97,7 +97,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.',
   },
   connector: {
-    general: 'An unexpected error occurred in connector.{{errorDescription}}',
+    general: 'Error occurred in connector: {{errorDescription}}',
     not_found: 'Cannot find any available connector for type: {{type}}.',
     not_enabled: 'The connector is not enabled.',
     invalid_metadata: "The connector's metadata is invalid.",
diff --git a/packages/phrases/src/locales/en/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/en/translation/admin-console/connector-details.ts
index 4d913ebbb..6d15fdce9 100644
--- a/packages/phrases/src/locales/en/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/en/translation/admin-console/connector-details.ts
@@ -9,13 +9,14 @@ const connector_details = {
   save_error_empty_config: 'Please enter config',
   send: 'Send',
   send_error_invalid_format: 'Invalid input',
-  edit_config_label: 'Enter your json here',
+  edit_config_label: 'Enter your JSON here',
   test_email_sender: 'Test your email connector',
   test_sms_sender: 'Test your SMS connector',
   test_email_placeholder: 'Enter a test email address',
   test_sms_placeholder: 'Enter a test phone number',
-  test_message_sent: 'Test message sent!',
-  test_sender_description: 'You will receive a message if your json is rightly configured',
+  test_message_sent: 'Test message sent',
+  test_sender_description:
+    'Logto uses the "Generic" template for testing. You will receive a message if your connector is rightly configured.',
   options_change_email: 'Change email connector',
   options_change_sms: 'Change SMS connector',
   connector_deleted: 'The connector has been successfully deleted',
diff --git a/packages/phrases/src/locales/en/translation/admin-console/errors.ts b/packages/phrases/src/locales/en/translation/admin-console/errors.ts
index f31378cc0..51139114c 100644
--- a/packages/phrases/src/locales/en/translation/admin-console/errors.ts
+++ b/packages/phrases/src/locales/en/translation/admin-console/errors.ts
@@ -16,7 +16,7 @@ const errors = {
   password_pattern_error:
     'Password requires a minimum of {{min}} characters and contains a mix of letters, numbers, and symbols.',
   insecure_contexts: 'Insecure contexts (non-HTTPS) are not supported.',
-  unexpected_error: 'An unexpected error occurred',
+  unexpected_error: 'An unexpected error occurred.',
   not_found: '404 not found',
   create_internal_role_violation:
     'You are creating a new internal role which is forbidden by Logto. Try another name that does not start with "#internal:".',
diff --git a/packages/phrases/src/locales/fr/errors.ts b/packages/phrases/src/locales/fr/errors.ts
index bdd812bc2..56fd3149e 100644
--- a/packages/phrases/src/locales/fr/errors.ts
+++ b/packages/phrases/src/locales/fr/errors.ts
@@ -102,7 +102,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.', // UNTRANSLATED
   },
   connector: {
-    general: "Une erreur inattendue s'est produite dans le connecteur. {{errorDescription}}",
+    general: "Une erreur s'est produite dans le connecteur: {{errorDescription}}",
     not_found: 'Impossible de trouver un connecteur disponible pour le type : {{type}}.',
     not_enabled: "Le connecteur n'est pas activé.",
     invalid_metadata: "The connector's metadata is invalid.", // UNTRANSLATED
diff --git a/packages/phrases/src/locales/fr/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/fr/translation/admin-console/connector-details.ts
index 5c9d84a43..521559516 100644
--- a/packages/phrases/src/locales/fr/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/fr/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: 'Testez votre connecteur SMS',
   test_email_placeholder: 'Entrez une adresse email de test',
   test_sms_placeholder: 'Entrez un numéro de téléphone de test',
-  test_message_sent: 'Message de test envoyé !',
-  test_sender_description: 'Vous recevrez un message si votre json est correctement configuré.',
+  test_message_sent: 'Message de test envoyé',
+  test_sender_description:
+    'Logto utilise le modèle "Generic" pour les tests. Tu recevras un message si ton connecteur est correctement configuré.',
   options_change_email: 'Modifier le connecteur Email',
   options_change_sms: 'Changer le connecteur SMS',
   connector_deleted: 'Le connecteur a été supprimé avec succès',
diff --git a/packages/phrases/src/locales/ko/errors.ts b/packages/phrases/src/locales/ko/errors.ts
index f4c29a2c1..718dc6b65 100644
--- a/packages/phrases/src/locales/ko/errors.ts
+++ b/packages/phrases/src/locales/ko/errors.ts
@@ -94,7 +94,7 @@ const errors = {
     interaction_not_found: '인터렉션 세션을 찾을 수 없어요. 처음부터 다시 세션을 시작해 주세요.',
   },
   connector: {
-    general: '연동 중에 알 수 없는 오류가 발생했어요. {{errorDescription}}',
+    general: '커넥터에서 오류가 발생했습니다: {{errorDescription}}',
     not_found: '{{type}} 값을 가진 연동 종류를 찾을 수 없어요.',
     not_enabled: '연동이 활성화되지 않았어요.',
     invalid_metadata: '연동 메타데이터가 유효하지 않아요.',
diff --git a/packages/phrases/src/locales/ko/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/ko/translation/admin-console/connector-details.ts
index f80206f28..1088a18cc 100644
--- a/packages/phrases/src/locales/ko/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/ko/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: 'SMS 연동 테스트',
   test_email_placeholder: '테스트 이메일 주소를 입력해 주세요.',
   test_sms_placeholder: '테스트 휴대전화번호를 입력해 주세요.',
-  test_message_sent: '테스트 메세지 전송 완료!',
-  test_sender_description: 'JSON 설정이 정확하다면, 메세지를 받을 거에요.',
+  test_message_sent: '테스트 메세지 전송 완료',
+  test_sender_description:
+    'Logto는 "Generic" 템플릿을 사용하여 테스트합니다. 커넥터가 올바르게 구성되면 메시지를 받게 됩니다.',
   options_change_email: '이메일 연동 수정',
   options_change_sms: 'SMS 연동 수정',
   connector_deleted: '연동이 성공적으로 제거되었어요.',
diff --git a/packages/phrases/src/locales/pt-br/errors.ts b/packages/phrases/src/locales/pt-br/errors.ts
index 668b76ec5..0d044bb0e 100644
--- a/packages/phrases/src/locales/pt-br/errors.ts
+++ b/packages/phrases/src/locales/pt-br/errors.ts
@@ -98,7 +98,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.', // UNTRANSLATED
   },
   connector: {
-    general: 'Ocorreu um erro inesperado no conector.{{errorDescription}}',
+    general: 'Ocorreu um erro no conector: {{errorDescription}}',
     not_found: 'Não foi possível encontrar nenhum conector disponível para o tipo: {{type}}.',
     not_enabled: 'O conector não está ativado.',
     invalid_metadata: 'Os metadados do conector são inválidos.',
diff --git a/packages/phrases/src/locales/pt-br/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/pt-br/translation/admin-console/connector-details.ts
index ed5b205a6..838f77a1d 100644
--- a/packages/phrases/src/locales/pt-br/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/pt-br/translation/admin-console/connector-details.ts
@@ -14,9 +14,9 @@ const connector_details = {
   test_sms_sender: 'Teste seu conector SMS',
   test_email_placeholder: 'Insira um endereço de e-mail de teste',
   test_sms_placeholder: 'Digite um número de telefone de teste',
-  test_message_sent: 'Mensagem de teste enviada!',
+  test_message_sent: 'Mensagem de teste enviada',
   test_sender_description:
-    'Você receberá uma mensagem se seu json estiver configurado corretamente',
+    'O Logto utiliza o modelo "Generic" para testes. Você receberá uma mensagem se o seu conector estiver configurado corretamente.',
   options_change_email: 'Alterar conector de e-mail',
   options_change_sms: 'Alterar conector de SMS',
   connector_deleted: 'O conector foi excluído com sucesso',
diff --git a/packages/phrases/src/locales/pt-pt/errors.ts b/packages/phrases/src/locales/pt-pt/errors.ts
index 907f43802..2e6332eec 100644
--- a/packages/phrases/src/locales/pt-pt/errors.ts
+++ b/packages/phrases/src/locales/pt-pt/errors.ts
@@ -98,7 +98,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.', // UNTRANSLATED
   },
   connector: {
-    general: 'Ocorreu um erro inesperado no conector.{{errorDescription}}',
+    general: 'Ocorreu um erro no conector: {{errorDescription}}',
     not_found: 'Não é possível encontrar nenhum conector disponível para o tipo: {{type}}.',
     not_enabled: 'O conector não está ativo.',
     invalid_metadata: 'Os metadados do conector são inválidos.',
diff --git a/packages/phrases/src/locales/pt-pt/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/pt-pt/translation/admin-console/connector-details.ts
index 2084fe05b..0c2686305 100644
--- a/packages/phrases/src/locales/pt-pt/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/pt-pt/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: 'Teste o conector de SMS',
   test_email_placeholder: 'Insira um endereço de email para o teste',
   test_sms_placeholder: 'Insira um número de telefone para o teste',
-  test_message_sent: 'Mensagem de teste enviada!',
-  test_sender_description: 'Receberá uma mensagem se o JSON estiver configurado corretamente',
+  test_message_sent: 'Mensagem de teste enviada',
+  test_sender_description:
+    'O Logto utiliza o modelo "Generic" para testes. Receberás uma mensagem se o teu conector estiver configurado corretamente.',
   options_change_email: 'Alterar conector de email',
   options_change_sms: 'Alterar conector de SMS',
   connector_deleted: 'O conector foi removido com sucesso',
diff --git a/packages/phrases/src/locales/tr-tr/errors.ts b/packages/phrases/src/locales/tr-tr/errors.ts
index 74f426b23..5e0292e4e 100644
--- a/packages/phrases/src/locales/tr-tr/errors.ts
+++ b/packages/phrases/src/locales/tr-tr/errors.ts
@@ -98,7 +98,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.', // UNTRANSLATED
   },
   connector: {
-    general: 'Bağlayıcıda beklenmeyen bir hata oldu.{{errorDescription}}',
+    general: 'Bağdaştırıcıda bir hata oluştu: {{errorDescription}}',
     not_found: '{{type}} tipi icin uygun bağlayıcı bulunamadı.',
     not_enabled: 'Bağlayıcı etkin değil.',
     invalid_metadata: "The connector's metadata is invalid.", // UNTRANSLATED
diff --git a/packages/phrases/src/locales/tr-tr/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/tr-tr/translation/admin-console/connector-details.ts
index bf5ceace2..f14a9f4d8 100644
--- a/packages/phrases/src/locales/tr-tr/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/tr-tr/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: 'SMS connectorunuzu test edin',
   test_email_placeholder: 'Test e-posta adresi girin',
   test_sms_placeholder: 'Test telefon numarası girin',
-  test_message_sent: 'Test mesajı gönderildi!',
-  test_sender_description: 'Eğer jsonunuz doğru yapılandırılmışsa bir mesaj alacaksınız',
+  test_message_sent: 'Test mesajı gönderildi',
+  test_sender_description:
+    'Logto testler için "Generic" şablonunu kullanır. Bağlantınız doğru şekilde yapılandırılmışsa bir mesaj alacaksınız.',
   options_change_email: 'Eposta connectorunuzu değiştirin',
   options_change_sms: 'SMS connectorunuzu değiştirin',
   connector_deleted: 'Connector başarıyla silindi',
diff --git a/packages/phrases/src/locales/zh-cn/errors.ts b/packages/phrases/src/locales/zh-cn/errors.ts
index fc470ba49..d13c2d381 100644
--- a/packages/phrases/src/locales/zh-cn/errors.ts
+++ b/packages/phrases/src/locales/zh-cn/errors.ts
@@ -90,7 +90,7 @@ const errors = {
       'Interaction session not found. Please go back and start the session again.', // UNTRANSLATED
   },
   connector: {
-    general: '连接器发生未知错误{{errorDescription}}',
+    general: '连接器发生错误：{{errorDescription}}',
     not_found: '找不到可用的 {{type}} 类型的连接器',
     not_enabled: '连接器尚未启用',
     invalid_metadata: '连接器 metadata 参数错误',
diff --git a/packages/phrases/src/locales/zh-cn/translation/admin-console/connector-details.ts b/packages/phrases/src/locales/zh-cn/translation/admin-console/connector-details.ts
index ba2f8ed1e..c18445b5e 100644
--- a/packages/phrases/src/locales/zh-cn/translation/admin-console/connector-details.ts
+++ b/packages/phrases/src/locales/zh-cn/translation/admin-console/connector-details.ts
@@ -14,8 +14,9 @@ const connector_details = {
   test_sms_sender: '测试你的短信连接器',
   test_email_placeholder: '请输入一个用于测试的邮件地址',
   test_sms_placeholder: '请输入一个用于测试的手机号码',
-  test_message_sent: '测试信息已发送！',
-  test_sender_description: '如果你的 JSON 配置正确，你会收到一条测试消息。',
+  test_message_sent: '测试信息已发送',
+  test_sender_description:
+    'Logto 使用"Generic"模板进行测试。如果你的连接器正确配置，你将收到一条消息。',
   options_change_email: '更换邮件连接器',
   options_change_sms: '更换短信连接器',
   connector_deleted: '成功删除连接器',