diff --git a/projects/ucap-webmessenger-app/src/app/pages/account/components/login.page.component.ts b/projects/ucap-webmessenger-app/src/app/pages/account/components/login.page.component.ts
index 127eb536..1f9d2f9c 100644
--- a/projects/ucap-webmessenger-app/src/app/pages/account/components/login.page.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/pages/account/components/login.page.component.ts
@@ -205,7 +205,7 @@ export class LoginPageComponent implements OnInit, OnDestroy {
             'accounts.results.doLogoutDuplicate',
             {
               ip: personLogout.ip,
-              mac: personLogout.mac
+              mac: personLogout.mac.replace(/:/g, '-')
             }
           );
 
diff --git a/projects/ucap-webmessenger-app/src/assets/i18n/en.json b/projects/ucap-webmessenger-app/src/assets/i18n/en.json
index 63d2e61f..589ac713 100644
--- a/projects/ucap-webmessenger-app/src/assets/i18n/en.json
+++ b/projects/ucap-webmessenger-app/src/assets/i18n/en.json
@@ -22,7 +22,7 @@
     "results": {
       "changedPassword": "Password changed. Please log in again.",
       "doLogout": "You have been logged out.",
-      "doLogoutDuplicate": "You logged in from another device.<br/> * Ip : {{ip}}<br/> * Mac : {{mac}}",
+      "doLogoutDuplicate": "You are logged in with the same username elsewhere.<br/>Please check the contact information below.<br/><br/>[IP]: {{ip}}<br/>[MAC]: {{mac}}",
       "doLogoutByOthers": "Forced logout by user."
     },
     "errors": {
diff --git a/projects/ucap-webmessenger-app/src/assets/i18n/ko.json b/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
index 990c7836..73efa1c9 100644
--- a/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
+++ b/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
@@ -22,7 +22,7 @@
     "results": {
       "changedPassword": "비밀번호가 변경되었습니다. 다시 로그인하여 주십시오",
       "doLogout": "로그아웃 되었습니다.",
-      "doLogoutDuplicate": "다른 디바이스에서 로그인하였습니다.<br/> * Ip : {{ip}}<br/> * Mac : {{mac}}",
+      "doLogoutDuplicate": "다른 곳에서 같은 아이디로 로그인하였습니다.<br/>아래 상대방 접속 정보를 확인하세요.<br/><br/> [IP] : {{ip}}<br/>[MAC] : {{mac}}",
       "doLogoutByOthers": "사용자에 의해 강제로그아웃 하였습니다."
     },
     "errors": {