diff --git a/src/auth/AuthManager.ts b/src/auth/AuthManager.ts
index 0aa3b639..62f07eb4 100644
--- a/src/auth/AuthManager.ts
+++ b/src/auth/AuthManager.ts
@@ -2,7 +2,7 @@ import { ServerType } from '@sasjs/utils/types'
 import { RequestClient } from '../request/RequestClient'
 import { NotFoundError } from '../types/errors'
 import { LoginOptions, LoginResult, LoginResultInternal } from '../types/Login'
-import { serialize } from '../utils'
+import { serialize, getUserLanguage } from '../utils'
 import { extractUserLongNameSas9 } from '../utils/sas9/extractUserLongNameSas9'
 import { openWebPage } from './openWebPage'
 import { verifySas9Login } from './verifySas9Login'
@@ -14,6 +14,44 @@ export class AuthManager {
   private loginUrl: string
   private logoutUrl: string
   private redirectedLoginUrl = `/SASLogon` //SAS 9 M8 no longer redirects from `/SASLogon/home` to the login page. `/SASLogon` seems to be stable enough across SAS versions
+  private defaultSuccessHeaderKey = 'default'
+  private successHeaders: { [key: string]: string } = {
+    es: `Ya se ha iniciado la sesi\u00f3n.`,
+    th: `\u0e04\u0e38\u0e13\u0e25\u0e07\u0e0a\u0e37\u0e48\u0e2d\u0e40\u0e02\u0e49\u0e32\u0e43\u0e0a\u0e49\u0e41\u0e25\u0e49\u0e27`,
+    ja: `\u30b5\u30a4\u30f3\u30a4\u30f3\u3057\u307e\u3057\u305f\u3002`,
+    nb: `Du har logget deg p\u00e5.`,
+    sl: `Prijavili ste se.`,
+    ar: `\u0644\u0642\u062f \u0642\u0645\u062a `,
+    sk: `Prihl\u00e1sili ste sa.`,
+    zh_HK: `\u60a8\u5df2\u767b\u5165\u3002`,
+    zh_CN: `\u60a8\u5df2\u767b\u5f55\u3002`,
+    it: `L'utente si \u00e8 connesso.`,
+    sv: `Du har loggat in.`,
+    he: `\u05e0\u05db\u05e0\u05e1\u05ea `,
+    nl: `U hebt zich aangemeld.`,
+    pl: `Zosta\u0142e\u015b zalogowany.`,
+    ko: `\ub85c\uadf8\uc778\ud588\uc2b5\ub2c8\ub2e4.`,
+    zh_TW: `\u60a8\u5df2\u767b\u5165\u3002`,
+    tr: `Oturum a\u00e7t\u0131n\u0131z.`,
+    iw: `\u05e0\u05db\u05e0\u05e1\u05ea `,
+    fr: `Vous \u00eates connect\u00e9.`,
+    uk: `\u0412\u0438 \u0432\u0432\u0456\u0439\u0448\u043b\u0438 \u0432 \u043e\u0431\u043b\u0456\u043a\u043e\u0432\u0438\u0439 \u0437\u0430\u043f\u0438\u0441.`,
+    pt_BR: `Voc\u00ea se conectou.`,
+    no: `Du har logget deg p\u00e5.`,
+    cs: `Jste p\u0159ihl\u00e1\u0161eni.`,
+    fi: `Olet kirjautunut sis\u00e4\u00e4n.`,
+    ru: `\u0412\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u043b\u0438 \u0432\u0445\u043e\u0434 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0443.`,
+    el: `\u0388\u03c7\u03b5\u03c4\u03b5 \u03c3\u03c5\u03bd\u03b4\u03b5\u03b8\u03b5\u03af.`,
+    hr: `Prijavili ste se.`,
+    da: `Du er logget p\u00e5.`,
+    de: `Sie sind jetzt angemeldet.`,
+    sh: `Prijavljeni ste.`,
+    pt: `Iniciou sess\u00e3o.`,
+    hu: `Bejelentkezett.`,
+    sr: `Prijavljeni ste.`,
+    en: enLoginSuccessHeader,
+    [this.defaultSuccessHeaderKey]: enLoginSuccessHeader
+  }
 
   constructor(
     private serverUrl: string,
@@ -132,7 +170,10 @@ export class AuthManager {
 
     let loginResponse = await this.sendLoginRequest(loginForm, loginParams)
 
-    let isLoggedIn = isLogInSuccess(this.serverType, loginResponse)
+    let isLoggedIn = this.isLogInSuccessHeaderPresent(
+      this.serverType,
+      loginResponse
+    )
 
     if (!isLoggedIn) {
       if (isCredentialsVerifyError(loginResponse)) {
@@ -166,6 +207,50 @@ export class AuthManager {
     }
   }
 
+  /**
+   * Checks if Login success header is present in the response based on language settings of the browser
+   * @param serverType - server type
+   * @param response - response object
+   * @returns - return boolean indicating if Login success header is present
+   */
+  private isLogInSuccessHeaderPresent(
+    serverType: ServerType,
+    response: any
+  ): boolean {
+    if (serverType === ServerType.Sasjs) return response?.loggedin
+
+    // get default success header
+    let successHeader = this.successHeaders[this.defaultSuccessHeaderKey]
+
+    // get user language based on language settings of the browser
+    const userLang = getUserLanguage()
+
+    if (userLang) {
+      // get success header on exact match of the language code
+      let userLangSuccessHeader = this.successHeaders[userLang]
+
+      // handle case when there is no exact match of the language code
+      if (!userLangSuccessHeader) {
+        // get all supported language codes
+        const headerLanguages = Object.keys(this.successHeaders)
+
+        // find language code on partial match
+        const headerLanguage = headerLanguages.find((language) =>
+          new RegExp(language, 'i').test(userLang)
+        )
+
+        // reassign success header if partial match was found
+        if (headerLanguage) {
+          successHeader = this.successHeaders[headerLanguage]
+        }
+      } else {
+        successHeader = userLangSuccessHeader
+      }
+    }
+
+    return new RegExp(successHeader, 'gm').test(response)
+  }
+
   private async performCASSecurityCheck() {
     const casAuthenticationUrl = `${this.serverUrl}/SASStoredProcess/j_spring_cas_security_check`
 
@@ -385,8 +470,4 @@ const isCredentialsVerifyError = (response: string): boolean =>
     response
   )
 
-const isLogInSuccess = (serverType: ServerType, response: any): boolean => {
-  if (serverType === ServerType.Sasjs) return response?.loggedin
-
-  return /You have signed in/gm.test(response)
-}
+export const enLoginSuccessHeader = 'You have signed in.'
diff --git a/src/auth/spec/AuthManager.spec.ts b/src/auth/spec/AuthManager.spec.ts
index 198893a3..e9dacbbd 100644
--- a/src/auth/spec/AuthManager.spec.ts
+++ b/src/auth/spec/AuthManager.spec.ts
@@ -1,3 +1,7 @@
+/**
+ * @jest-environment jsdom
+ */
+
 import { AuthManager } from '../AuthManager'
 import * as dotenv from 'dotenv'
 import { ServerType } from '@sasjs/utils/types'
@@ -63,6 +67,12 @@ describe('AuthManager', () => {
   })
 
   describe('login - default mechanism', () => {
+    let languageGetter: any
+
+    beforeEach(() => {
+      languageGetter = jest.spyOn(window.navigator, 'language', 'get')
+    })
+
     it('should call the auth callback and return when already logged in', async () => {
       const authManager = new AuthManager(
         serverUrl,
@@ -294,6 +304,56 @@ describe('AuthManager', () => {
         mockLoginAuthoriseRequiredResponse
       )
     })
+
+    it('should check login success header based on language preferences of the browser', () => {
+      const authManager = new AuthManager(
+        serverUrl,
+        serverType,
+        requestClient,
+        authCallback
+      )
+
+      // test built in language codes
+      Object.keys(authManager['successHeaders']).forEach((key) => {
+        languageGetter.mockReturnValue(key)
+
+        expect(
+          authManager['isLogInSuccessHeaderPresent'](
+            serverType,
+            authManager['successHeaders'][key]
+          )
+        ).toBeTruthy()
+      })
+
+      // test possible longer language codes
+      const possibleLanguageCodes = [
+        { short: 'en', long: 'en-US' },
+        { short: 'fr', long: 'fr-FR' },
+        { short: 'es', long: 'es-ES' }
+      ]
+
+      possibleLanguageCodes.forEach((key) => {
+        const { short, long } = key
+        languageGetter.mockReturnValue(long)
+
+        expect(
+          authManager['isLogInSuccessHeaderPresent'](
+            serverType,
+            authManager['successHeaders'][short]
+          )
+        ).toBeTruthy()
+      })
+
+      // test falling back to default language code
+      languageGetter.mockReturnValue('WRONG-LANGUAGE')
+
+      expect(
+        authManager['isLogInSuccessHeaderPresent'](
+          serverType,
+          authManager['successHeaders'][authManager['defaultSuccessHeaderKey']]
+        )
+      ).toBeTruthy()
+    })
   })
 
   describe('login - redirect mechanism', () => {
diff --git a/src/auth/spec/mockResponses.ts b/src/auth/spec/mockResponses.ts
index 4aaad1d4..c30aa8f9 100644
--- a/src/auth/spec/mockResponses.ts
+++ b/src/auth/spec/mockResponses.ts
@@ -1,7 +1,8 @@
 import { SasAuthResponse } from '@sasjs/utils/types'
+import { enLoginSuccessHeader } from '../AuthManager'
 
 export const mockLoginAuthoriseRequiredResponse = `<form id="application_authorization" action="/SASLogon/oauth/authorize" method="POST"><input type="hidden" name="X-Uaa-Csrf" value="2nfuxIn6WaOURWL7tzTXCe"/>`
-export const mockLoginSuccessResponse = `You have signed in`
+export const mockLoginSuccessResponse = enLoginSuccessHeader
 
 export const mockAuthResponse: SasAuthResponse = {
   access_token: 'acc355',
diff --git a/src/auth/spec/verifySas9Login.spec.ts b/src/auth/spec/verifySas9Login.spec.ts
index c71f595b..19696d40 100644
--- a/src/auth/spec/verifySas9Login.spec.ts
+++ b/src/auth/spec/verifySas9Login.spec.ts
@@ -3,6 +3,7 @@
  */
 import { verifySas9Login } from '../verifySas9Login'
 import * as delayModule from '../../utils/delay'
+import { enLoginSuccessHeader } from '../AuthManager'
 
 describe('verifySas9Login', () => {
   const serverUrl = 'http://test-server.com'
@@ -18,7 +19,7 @@ describe('verifySas9Login', () => {
     const popup = {
       window: {
         location: { href: serverUrl + `/SASLogon` },
-        document: { body: { innerText: '<h3>You have signed in.</h3>' } }
+        document: { body: { innerText: `<h3>${enLoginSuccessHeader}</h3>` } }
       }
     } as unknown as Window
 
diff --git a/src/auth/spec/verifySasViyaLogin.spec.ts b/src/auth/spec/verifySasViyaLogin.spec.ts
index dc99e321..5183e07d 100644
--- a/src/auth/spec/verifySasViyaLogin.spec.ts
+++ b/src/auth/spec/verifySasViyaLogin.spec.ts
@@ -3,6 +3,7 @@
  */
 import { verifySasViyaLogin } from '../verifySasViyaLogin'
 import * as delayModule from '../../utils/delay'
+import { enLoginSuccessHeader } from '../AuthManager'
 
 describe('verifySasViyaLogin', () => {
   const serverUrl = 'http://test-server.com'
@@ -19,7 +20,7 @@ describe('verifySasViyaLogin', () => {
     const popup = {
       window: {
         location: { href: serverUrl + `/SASLogon` },
-        document: { body: { innerText: '<h3>You have signed in.</h3>' } }
+        document: { body: { innerText: `<h3>${enLoginSuccessHeader}</h3>` } }
       }
     } as unknown as Window
 
diff --git a/src/auth/verifySas9Login.ts b/src/auth/verifySas9Login.ts
index cf350f78..831117e6 100644
--- a/src/auth/verifySas9Login.ts
+++ b/src/auth/verifySas9Login.ts
@@ -1,4 +1,5 @@
 import { delay } from '../utils'
+import { enLoginSuccessHeader } from './AuthManager'
 
 export async function verifySas9Login(loginPopup: Window): Promise<{
   isLoggedIn: boolean
@@ -12,7 +13,7 @@ export async function verifySas9Login(loginPopup: Window): Promise<{
 
     isLoggedIn =
       loginPopup.window.location.href.includes('SASLogon') &&
-      loginPopup.window.document.body.innerText.includes('You have signed in.')
+      loginPopup.window.document.body.innerText.includes(enLoginSuccessHeader)
     elapsedSeconds = (new Date().valueOf() - startTime.valueOf()) / 1000
   } while (!isLoggedIn && elapsedSeconds < 5 * 60)
 
diff --git a/src/auth/verifySasViyaLogin.ts b/src/auth/verifySasViyaLogin.ts
index b65cef09..91e37442 100644
--- a/src/auth/verifySasViyaLogin.ts
+++ b/src/auth/verifySasViyaLogin.ts
@@ -1,4 +1,5 @@
 import { delay } from '../utils'
+import { enLoginSuccessHeader } from './AuthManager'
 
 export async function verifySasViyaLogin(loginPopup: Window): Promise<{
   isLoggedIn: boolean
@@ -20,9 +21,7 @@ export async function verifySasViyaLogin(loginPopup: Window): Promise<{
     if (loginPopup.closed) break
     isAuthorized =
       loginPopup.window.location.href.includes('SASLogon') ||
-      loginPopup.window.document.body?.innerText?.includes(
-        'You have signed in.'
-      )
+      loginPopup.window.document.body?.innerText?.includes(enLoginSuccessHeader)
     elapsedSeconds = (new Date().valueOf() - startTime.valueOf()) / 1000
   } while (!isAuthorized && elapsedSeconds < 5 * 60)
 
diff --git a/src/utils/getUserLanguage.ts b/src/utils/getUserLanguage.ts
new file mode 100644
index 00000000..1a0be1cf
--- /dev/null
+++ b/src/utils/getUserLanguage.ts
@@ -0,0 +1,10 @@
+interface IEnavigator {
+  userLanguage?: string
+}
+
+/**
+ * Provides preferred language of the user.
+ * @returns A string representing the preferred language of the user, usually the language of the browser UI. Examples of valid language codes include "en", "en-US", "fr", "fr-FR", "es-ES". More info available https://datatracker.ietf.org/doc/html/rfc5646
+ */
+export const getUserLanguage = () =>
+  window.navigator.language || (window.navigator as IEnavigator).userLanguage
diff --git a/src/utils/index.ts b/src/utils/index.ts
index cbc166ac..2a2b4059 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -20,3 +20,4 @@ export * from './serialize'
 export * from './splitChunks'
 export * from './validateInput'
 export * from './getFormData'
+export * from './getUserLanguage'