diff --git a/extensions/vscode/src/features/doctor.ts b/extensions/vscode/src/features/doctor.ts
index e4f0a88a7..aceb78d22 100644
--- a/extensions/vscode/src/features/doctor.ts
+++ b/extensions/vscode/src/features/doctor.ts
@@ -1,5 +1,5 @@
 import { getTsdk } from '@volar/vscode';
-import { ParseSFCRequest } from '@vue/language-server';
+import { GetConnectedNamedPipeServerRequest, ParseSFCRequest } from '@vue/language-server';
 import * as semver from 'semver';
 import * as vscode from 'vscode';
 import type { BaseLanguageClient } from 'vscode-languageclient';
@@ -257,6 +257,20 @@ export async function register(context: vscode.ExtensionContext, client: BaseLan
 			});
 		}
 
+		// #3942
+		const namedPipe = await client.sendRequest(GetConnectedNamedPipeServerRequest.type, fileUri.fsPath.replace(/\\/g, '/'));
+		if (namedPipe?.serverKind === 0) {
+			problems.push({
+				title: 'Missing jsconfig/tsconfig',
+				message: [
+					'The current file does not have a matching tsconfig/jsconfig, and extension version 2.0 will not work properly for this at the moment.',
+					'To avoid this problem, you can create a jsconfig in the project root, or downgrade to 1.8.27.',
+					'',
+					'Issue: https://github.com/vuejs/language-tools/issues/3942',
+				].join('\n'),
+			});
+		}
+
 		// check outdated vue language plugins
 		// check node_modules has more than one vue versions
 		// check ESLint, Prettier...
diff --git a/packages/language-server/lib/protocol.ts b/packages/language-server/lib/protocol.ts
index 3ab50a9fa..d85d71f2a 100644
--- a/packages/language-server/lib/protocol.ts
+++ b/packages/language-server/lib/protocol.ts
@@ -39,3 +39,13 @@ export namespace ParseSFCRequest {
 	export type ErrorType = never;
 	export const type = new vscode.RequestType<ParamsType, ResponseType, ErrorType>('vue/parseSfc');
 }
+
+export namespace GetConnectedNamedPipeServerRequest {
+	export type ParamsType = string;
+	export type ResponseType = {
+		path: string,
+		serverKind: number,
+	} | undefined;
+	export type ErrorType = never;
+	export const type = new vscode.RequestType<ParamsType, ResponseType, ErrorType>('vue/namedPipeServer');
+}
diff --git a/packages/language-server/node.ts b/packages/language-server/node.ts
index 35f202a4f..c54d890e9 100644
--- a/packages/language-server/node.ts
+++ b/packages/language-server/node.ts
@@ -5,6 +5,7 @@ import { ServiceEnvironment, convertAttrName, convertTagName, createVueServicePl
 import { DetectNameCasingRequest, GetConvertAttrCasingEditsRequest, GetConvertTagCasingEditsRequest, ParseSFCRequest } from './lib/protocol';
 import type { VueInitializationOptions } from './lib/types';
 import * as tsPluginClient from '@vue/typescript-plugin/lib/client';
+import { GetConnectedNamedPipeServerRequest } from './lib/protocol';
 
 export const connection: Connection = createConnection();
 
@@ -122,6 +123,13 @@ connection.onRequest(GetConvertAttrCasingEditsRequest.type, async params => {
 	}
 });
 
+connection.onRequest(GetConnectedNamedPipeServerRequest.type, async fileName => {
+	const connected = await tsPluginClient.connectForFile(fileName);
+	if (connected) {
+		return connected[1];
+	}
+});
+
 async function getService(uri: string) {
 	return (await server.projects.getProject(uri)).getLanguageService();
 }
diff --git a/packages/typescript-plugin/lib/client.ts b/packages/typescript-plugin/lib/client.ts
index 27d553281..e97cc495e 100644
--- a/packages/typescript-plugin/lib/client.ts
+++ b/packages/typescript-plugin/lib/client.ts
@@ -81,17 +81,18 @@ export function getElementAttrs(
 }
 
 async function sendRequest<T>(request: Request) {
-	const client = await connectForFile(request.args[0]);
-	if (!client) {
+	const connected = await connectForFile(request.args[0]);
+	if (!connected) {
 		console.warn('[Vue Named Pipe Client] No server found for', request.args[0]);
 		return;
 	}
+	const [client] = connected;
 	const result = await sendRequestWorker<T>(request, client);
 	client.end();
 	return result;
 }
 
-async function connectForFile(fileName: string) {
+export async function connectForFile(fileName: string) {
 	if (!fs.existsSync(pipeTable)) {
 		return;
 	}
@@ -106,7 +107,7 @@ async function connectForFile(fileName: string) {
 		if (client) {
 			const response = await sendRequestWorker<boolean>({ type: 'containsFile', args: [fileName] }, client);
 			if (response) {
-				return client;
+				return [client, server] as const;
 			}
 		}
 	}
@@ -114,7 +115,7 @@ async function connectForFile(fileName: string) {
 		if (!path.relative(server.currentDirectory, fileName).startsWith('..')) {
 			const client = await connect(server.path);
 			if (client) {
-				return client;
+				return [client, server] as const;
 			}
 		}
 	}
diff --git a/packages/typescript-plugin/lib/server.ts b/packages/typescript-plugin/lib/server.ts
index 65a052f6d..9df744b67 100644
--- a/packages/typescript-plugin/lib/server.ts
+++ b/packages/typescript-plugin/lib/server.ts
@@ -81,7 +81,7 @@ export function startNamedPipeServer(serverKind: ts.server.ProjectKind, currentD
 		connection.on('error', err => console.error('[Vue Named Pipe Server]', err.message));
 	});
 
-	clearupPipeTable();
+	cleanupPipeTable();
 
 	if (!fs.existsSync(pipeTable)) {
 		fs.writeFileSync(pipeTable, JSON.stringify([] satisfies NamedPipeServer[]));
@@ -101,7 +101,7 @@ export function startNamedPipeServer(serverKind: ts.server.ProjectKind, currentD
 	server.listen(pipeFile);
 }
 
-function clearupPipeTable() {
+function cleanupPipeTable() {
 	if (!fs.existsSync(pipeTable)) {
 		return;
 	}