diff --git a/src/assets/shared/lib/axios.ts b/src/assets/shared/lib/axios.ts
index a87c842e..1984cab9 100644
--- a/src/assets/shared/lib/axios.ts
+++ b/src/assets/shared/lib/axios.ts
@@ -9,9 +9,13 @@ export class TokenRefreshError extends Error {
   }
 }
 
-export const baseURL = import.meta.env.DEV
-  ? ''
-  : 'https://port-0-gami-server-mj0rdvda8d11523e.sel3.cloudtype.app';
+const DEFAULT_BACKEND =
+  'https://port-0-gami-server-mj0rdvda8d11523e.sel3.cloudtype.app';
+
+// Allow override via Vite env var VITE_API_BASE for local testing.
+// Fallback to DEFAULT_BACKEND to avoid dev-time proxying to vite origin.
+export const baseURL: string =
+  (import.meta.env.VITE_API_BASE as string) || DEFAULT_BACKEND;
 
 export const instance = axios.create({
   baseURL,
diff --git a/src/hooks/useStomp.ts b/src/hooks/useStomp.ts
index b21fecb2..a27f03fe 100644
--- a/src/hooks/useStomp.ts
+++ b/src/hooks/useStomp.ts
@@ -210,41 +210,33 @@ export function useStomp<TRoomMessage = unknown>(
       }
 
       isConnectingRef.current = true;
+      const backendOriginRaw =
+        baseURL && baseURL !== '' ? baseURL : window.location.origin;
+      let backendOrigin = String(backendOriginRaw);
+
+      if (backendOrigin.startsWith('ws:')) {
+        backendOrigin = backendOrigin.replace(/^ws:/, 'http:');
+      } else if (backendOrigin.startsWith('wss:')) {
+        backendOrigin = backendOrigin.replace(/^wss:/, 'https:');
+      }
 
-      const wsUrl = `${baseURL}/ws`;
+      const sockjsUrl = backendOrigin.endsWith('/')
+        ? backendOrigin + 'ws'
+        : backendOrigin + '/ws';
 
       if (connectionTimeoutIdRef.current) {
         clearTimeout(connectionTimeoutIdRef.current);
         connectionTimeoutIdRef.current = null;
       }
 
-      const socket = new SockJS(wsUrl, null, {
-        transports: ['websocket', 'xhr-streaming', 'xhr-polling'],
-      });
-
-      socket.onerror = (error: Event) => {
-        console.error('SockJS 오류:', error);
-        isConnectingRef.current = false;
-        if (connectionTimeoutIdRef.current) {
-          clearTimeout(connectionTimeoutIdRef.current);
-          connectionTimeoutIdRef.current = null;
-        }
-      };
-
-      socket.onclose = () => {
-        isConnectingRef.current = false;
-        if (connectionTimeoutIdRef.current) {
-          clearTimeout(connectionTimeoutIdRef.current);
-          connectionTimeoutIdRef.current = null;
-        }
-      };
-
       const client = new Client({
-        webSocketFactory: () => socket as WebSocket,
+        // SockJS 인스턴스를 webSocketFactory에서 직접 생성해서 반환합니다.
+        webSocketFactory: () => new SockJS(sockjsUrl),
         connectHeaders: {
           Authorization: `Bearer ${token}`,
         },
-        reconnectDelay: 0,
+        // 재접속 지연을 두어 반복 연결 시도를 완화합니다.
+        reconnectDelay: 2000,
         heartbeatIncoming: 4000,
         heartbeatOutgoing: 4000,
         connectionTimeout: 10000,
diff --git a/src/pages/chat/ChatApplyPage.tsx b/src/pages/chat/ChatApplyPage.tsx
index 929df0c8..3a33caf1 100644
--- a/src/pages/chat/ChatApplyPage.tsx
+++ b/src/pages/chat/ChatApplyPage.tsx
@@ -78,7 +78,6 @@ export default function ChatApplyPage() {
     return () => {
       disconnectWebSocket();
     };
-    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [connectWebSocket, disconnectWebSocket]);
 
   useEffect(() => {
diff --git a/src/pages/chat/ChatPage.tsx b/src/pages/chat/ChatPage.tsx
index ab7ea790..efddb700 100644
--- a/src/pages/chat/ChatPage.tsx
+++ b/src/pages/chat/ChatPage.tsx
@@ -406,6 +406,13 @@ export default function ChatPage() {
       return;
     }
 
+    if (message.length > 250) {
+      toast.error(
+        `메시지는 250자 이하로 작성해주세요. (현재 ${message.length}자)`
+      );
+      return;
+    }
+
     if (!isConnected()) {
       toast.error(
         'WebSocket이 연결되지 않았습니다. 잠시 후 다시 시도해주세요.'
diff --git a/src/pages/mentoring/MentoringPage.tsx b/src/pages/mentoring/MentoringPage.tsx
index 0ccde095..c77d6dd4 100644
--- a/src/pages/mentoring/MentoringPage.tsx
+++ b/src/pages/mentoring/MentoringPage.tsx
@@ -50,6 +50,12 @@ interface SentApply {
   createdAt: string;
 }
 
+type MentorParams = {
+  page: number;
+  size: number;
+  generation?: number;
+};
+
 export default function MentoringPage() {
   const [allMentors, setAllMentors] = useState<MentorData[]>([]);
   const [searchQuery, setSearchQuery] = useState('');
@@ -62,22 +68,33 @@ export default function MentoringPage() {
     const fetchData = async () => {
       try {
         setIsLoading(true);
-        const [mentorsResponse, memberResponse, sentAppliesResponse] =
-          await Promise.all([
-            instance.get<MentorListResponse>('/api/mentoring/mentor/all', {
-              params: {
-                page: 0,
-                size: 100,
-              },
-            }),
-            instance.get<MemberInfo>('/api/member'),
-            instance
-              .get<SentApply[]>(API_PATHS.MENTORING_APPLY_SENT)
-              .catch(() => ({ data: [] })),
-          ]);
+
+        // 먼저 현재 멤버 정보를 가져와 generation을 확보합니다.
+        let memberResponse: { data: MemberInfo } | null = null;
+        try {
+          memberResponse = await instance.get<MemberInfo>('/api/member');
+          setCurrentMemberId(memberResponse.data.memberId);
+        } catch {
+          // 멤버 조회 실패(예: 비인증) 시에도 멘토 목록은 generation 없이 가져옵니다.
+          memberResponse = null;
+          setCurrentMemberId(null);
+        }
+
+        const mentorParams: MentorParams = { page: 0, size: 100 };
+        if (memberResponse && memberResponse.data.generation != null) {
+          mentorParams.generation = memberResponse.data.generation;
+        }
+
+        const [mentorsResponse, sentAppliesResponse] = await Promise.all([
+          instance.get<MentorListResponse>('/api/mentoring/mentor/all', {
+            params: mentorParams,
+          }),
+          instance
+            .get<SentApply[]>(API_PATHS.MENTORING_APPLY_SENT)
+            .catch(() => ({ data: [] })),
+        ]);
 
         setAllMentors(mentorsResponse.data.content);
-        setCurrentMemberId(memberResponse.data.memberId);
         if (Array.isArray(sentAppliesResponse.data)) {
           setSentApplies(sentAppliesResponse.data);
         }