diff --git a/src/main/ts/.editorconfig b/src/main/ts/.editorconfig
index 4389119..e89330a 100644
--- a/src/main/ts/.editorconfig
+++ b/src/main/ts/.editorconfig
@@ -3,7 +3,7 @@ root = true
 
 [*]
 charset = utf-8
-indent_style = tab
+indent_style = space
 indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
diff --git a/src/main/ts/package.json b/src/main/ts/package.json
index 81de99e..6905e4e 100644
--- a/src/main/ts/package.json
+++ b/src/main/ts/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "scripts": {
     "ng": "ng",
-    "start": "ng serve",
+    "start": "ng serve --proxy-config proxy.conf.json",
     "build": "ng build",
     "test": "ng test",
     "lint": "ng lint",
diff --git a/src/main/ts/proxy.conf.json b/src/main/ts/proxy.conf.json
new file mode 100644
index 0000000..7d4976b
--- /dev/null
+++ b/src/main/ts/proxy.conf.json
@@ -0,0 +1,6 @@
+{
+  "/api": {
+    "target": "http://localhost:8080",
+    "secure": false
+  }
+}
diff --git a/src/main/ts/src/app/app-routing.module.ts b/src/main/ts/src/app/app-routing.module.ts
index d425c6f..f49aa1a 100644
--- a/src/main/ts/src/app/app-routing.module.ts
+++ b/src/main/ts/src/app/app-routing.module.ts
@@ -1,7 +1,12 @@
+import { AppComponent } from './app.component';
+import { ServiceUnavailableComponent } from './service-unavailable/service-unavailable.component';
 import { NgModule } from '@angular/core';
 import { Routes, RouterModule } from '@angular/router';
 
-const routes: Routes = [];
+const routes: Routes = [
+  { path: 'serviceUnavailable', component: ServiceUnavailableComponent },
+  { path: '', component: AppComponent }
+];
 
 @NgModule({
   imports: [RouterModule.forRoot(routes)],
diff --git a/src/main/ts/src/app/app.module.ts b/src/main/ts/src/app/app.module.ts
index 74af512..d2dd112 100644
--- a/src/main/ts/src/app/app.module.ts
+++ b/src/main/ts/src/app/app.module.ts
@@ -1,6 +1,10 @@
+import { ServiceUnavailableInterceptor } from './core/interceptors/service-unavailable.interceptor';
+import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
+import { UserService } from './core/services/user.service';
 
 import { BrowserModule } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
+import { FormsModule } from '@angular/forms';
 
 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';
@@ -9,21 +13,34 @@ import { HeaderComponent } from './header/header.component';
 import { FooterComponent } from './footer/footer.component';
 import { NotificationElement } from './core/notifications/notification-element/notification-element.component';
 import { NotificationsComponent } from './core/notifications/notifications.component';
+import { LoginComponent } from './login/login.component';
+import { ServiceUnavailableComponent } from './service-unavailable/service-unavailable.component';
 
 @NgModule({
    declarations: [
       AppComponent,
       FooterComponent,
       HeaderComponent,
+      LoginComponent,
       NotificationElement,
-      NotificationsComponent
+      NotificationsComponent,
+      ServiceUnavailableComponent
    ],
    imports: [
-      BrowserModule,
       AppRoutingModule,
+      BrowserModule,
+      FormsModule,
+      HttpClientModule,
       MDBBootstrapModule.forRoot()
    ],
-   providers: [],
+   providers: [
+      UserService,
+      {
+        provide: HTTP_INTERCEPTORS,
+        useClass: ServiceUnavailableInterceptor,
+        multi: true
+      }
+   ],
    bootstrap: [
       AppComponent
    ]
diff --git a/src/main/ts/src/app/core/entities.ts b/src/main/ts/src/app/core/entities.ts
new file mode 100644
index 0000000..9712033
--- /dev/null
+++ b/src/main/ts/src/app/core/entities.ts
@@ -0,0 +1,46 @@
+export class User {
+  constructor(
+    public id: string,
+    public name: string,
+    public email: string
+  ) {}
+
+  public static new(): User {
+    return new User('', '', '');
+  }
+}
+
+export class SignUpDTO {
+  constructor(
+    public name: string,
+    public email: string,
+    public password: string,
+    public confirmPassword: string
+  ) {}
+
+  public static new(): SignUpDTO {
+    return new SignUpDTO('', '', '', '');
+  }
+}
+
+export class ConfigurationFile {
+  constructor(
+    public id: string
+  ) {}
+
+  public static new(): ConfigurationFile {
+    return new ConfigurationFile('');
+  }
+}
+
+export class Application {
+  constructor(
+    public id: string,
+    public name: string,
+    public configurationFileList: Array<ConfigurationFile>
+  ) {}
+
+  public static new(): Application {
+    return new Application('', '', []);
+  }
+}
diff --git a/src/main/ts/src/app/core/interceptors/service-unavailable.interceptor.ts b/src/main/ts/src/app/core/interceptors/service-unavailable.interceptor.ts
new file mode 100644
index 0000000..4e23192
--- /dev/null
+++ b/src/main/ts/src/app/core/interceptors/service-unavailable.interceptor.ts
@@ -0,0 +1,25 @@
+import { Injectable } from '@angular/core';
+import { HttpInterceptor, HttpEvent, HttpHandler, HttpRequest } from '@angular/common/http';
+import { Observable, throwError } from 'rxjs';
+import { Router } from '@angular/router';
+import { catchError } from 'rxjs/operators';
+import { NotificationsComponent } from '../notifications/notifications.component';
+
+@Injectable({providedIn: 'root'})
+export class ServiceUnavailableInterceptor implements HttpInterceptor {
+
+  constructor(
+    private router: Router
+  ) {}
+
+  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
+    return next.handle(req).pipe(catchError(ex => {
+      if (!!ex && ex.status === 504) {
+        NotificationsComponent.error('Le serveur est actuellement indisponible. Veuillez contacter l\'administrateur.');
+        this.router.navigate(['/serviceUnavailable']);
+      }
+
+      return throwError(ex);
+    }));
+  }
+}
diff --git a/src/main/ts/src/app/core/services/user.service.spec.ts b/src/main/ts/src/app/core/services/user.service.spec.ts
new file mode 100644
index 0000000..79eb548
--- /dev/null
+++ b/src/main/ts/src/app/core/services/user.service.spec.ts
@@ -0,0 +1,16 @@
+/* tslint:disable:no-unused-variable */
+
+import { TestBed, async, inject } from '@angular/core/testing';
+import { UserService } from './user.service';
+
+describe('Service: User', () => {
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [UserService]
+    });
+  });
+
+  it('should ...', inject([UserService], (service: UserService) => {
+    expect(service).toBeTruthy();
+  }));
+});
diff --git a/src/main/ts/src/app/core/services/user.service.ts b/src/main/ts/src/app/core/services/user.service.ts
new file mode 100644
index 0000000..8afa7f1
--- /dev/null
+++ b/src/main/ts/src/app/core/services/user.service.ts
@@ -0,0 +1,21 @@
+import { Observable } from 'rxjs';
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { User } from '../entities';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class UserService {
+  constructor(
+    private httpClient: HttpClient
+  ) {}
+
+  login(user: User): Observable<void> {
+    return this.httpClient.post<void>(`/api/users/login`, user);
+  }
+
+  disconnection(): Observable<void> {
+    return this.httpClient.get<void>(`/api/users/disconnection`);
+  }
+}
diff --git a/src/main/ts/src/app/header/header.component.html b/src/main/ts/src/app/header/header.component.html
index a43c536..7b880c5 100644
--- a/src/main/ts/src/app/header/header.component.html
+++ b/src/main/ts/src/app/header/header.component.html
@@ -11,9 +11,10 @@
     </a>
   </span>
   <span id="right-area">
-    <button mdbBtn class="flat rounded-pill" mdbWavesEffect>
+    <button mdbBtn class="flat rounded-pill" (click)="loginForm.show()" mdbWavesEffect>
       <i class="fa fa-sign-in-alt"></i>
       Connexion
     </button>
   </span>
 </header>
+<app-login #loginForm></app-login>
diff --git a/src/main/ts/src/app/header/header.component.ts b/src/main/ts/src/app/header/header.component.ts
index d0d0ebc..620e720 100644
--- a/src/main/ts/src/app/header/header.component.ts
+++ b/src/main/ts/src/app/header/header.component.ts
@@ -1,5 +1,6 @@
 import { NotificationsComponent } from './../core/notifications/notifications.component';
-import { Component, OnInit } from '@angular/core';
+import { Component, OnInit, ViewChild } from '@angular/core';
+import { LoginComponent } from '../login/login.component';
 
 @Component({
   selector: 'app-header',
@@ -7,6 +8,7 @@ import { Component, OnInit } from '@angular/core';
   styleUrls: ['./header.component.scss']
 })
 export class HeaderComponent implements OnInit {
+	@ViewChild('loginForm', {static: true}) loginForm: LoginComponent;
 
   constructor() { }
 
diff --git a/src/main/ts/src/app/login/login.component.html b/src/main/ts/src/app/login/login.component.html
new file mode 100644
index 0000000..4e0610e
--- /dev/null
+++ b/src/main/ts/src/app/login/login.component.html
@@ -0,0 +1,59 @@
+<div mdbModal
+		#loginModal="mdbModal"
+		class="modal fade"
+		tabindex="-1"
+		role="dialog"
+		aria-labelledby="loginModal"
+    aria-hidden="true">
+
+	<div class="modal-dialog" role="document">
+		<div class="modal-content">
+      <form (ngSubmit)="onSubmit()" ngNativeValidate>
+        <div class="modal-header">
+          <button type="button" class="close pull-right" aria-label="Close" (click)="loginModal.hide()">
+            <span aria-hidden="true">×</span>
+          </button>
+          <img src="assets/images/icon-64.png"/>
+          <h4 class="modal-title w-100">
+            Connexion
+          </h4>
+        </div>
+        <div class="modal-body">
+          <!-- Email address -->
+          <div class="md-form">
+            <input mdbInputDirective
+                type="email"
+                id="email"
+                name="email"
+                class="form-control"
+                #email="ngModel"
+                [(ngModel)]="model.email"
+                data-error="Veuillez saisir une adresse email valide"
+                [validateSuccess]="false"
+                required >
+            <label for="email">Adresse email</label>
+          </div>
+          <!-- Password -->
+          <div class="md-form">
+            <input mdbInputDirective
+                type="password"
+                id="password"
+                name="password"
+                class="form-control"
+                #password="ngModel"
+                [(ngModel)]="model.password"
+                data-error="Veuillez saisir votre mot de passe"
+                [validateSuccess]="false"
+                required >
+            <label for="password">Mot de passe</label>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button mdbBtn type="submit" color="indigo" size="sm" class="rounded-pill" mdbWavesEffect>
+            Valider
+          </button>
+        </div>
+      </form>
+		</div>
+	</div>
+</div>
diff --git a/src/main/ts/src/app/login/login.component.scss b/src/main/ts/src/app/login/login.component.scss
new file mode 100644
index 0000000..be3aabd
--- /dev/null
+++ b/src/main/ts/src/app/login/login.component.scss
@@ -0,0 +1,59 @@
+// #form {
+//   width: 300px;
+//   margin: auto;
+//   margin-top: 50px;
+// }
+
+// #logo {
+//   text-align: center;
+//   margin-bottom: 15px;
+// }
+
+// #title {
+//   text-align: center;
+//   font-size: 1.5em;
+// }
+
+// #buttons-area {
+//   button {
+//     width: 90%;
+//     margin: auto;
+//   }
+
+//   a {
+//     margin: auto;
+//     margin-bottom: 20px;
+//   }
+// }
+// #signup {
+//   text-align: center;
+//   margin-top: 35px;
+// }
+
+.modal-dialog {
+  margin-top: 50px;
+  width: 300px;
+
+  .modal-content {
+    .modal-header {
+      img {
+        position: absolute;
+        top: -25px;
+        left: 0;
+        right: 0;
+        margin-left: auto;
+        margin-right: auto;
+        width: 64px;
+      }
+      .modal-title {
+        margin-top: 30px;
+        text-align: center;
+        font-weight: bolder;
+      }
+    }
+
+    .modal-footer {
+      padding: 10px;
+    }
+  }
+}
diff --git a/src/main/ts/src/app/login/login.component.spec.ts b/src/main/ts/src/app/login/login.component.spec.ts
new file mode 100644
index 0000000..556444c
--- /dev/null
+++ b/src/main/ts/src/app/login/login.component.spec.ts
@@ -0,0 +1,28 @@
+/* tslint:disable:no-unused-variable */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { DebugElement } from '@angular/core';
+
+import { LoginComponent } from './login.component';
+
+describe('LoginComponent', () => {
+  let component: LoginComponent;
+  let fixture: ComponentFixture<LoginComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ LoginComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(LoginComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/src/main/ts/src/app/login/login.component.ts b/src/main/ts/src/app/login/login.component.ts
new file mode 100644
index 0000000..f3d865c
--- /dev/null
+++ b/src/main/ts/src/app/login/login.component.ts
@@ -0,0 +1,41 @@
+import { Component, OnInit, ViewChild } from '@angular/core';
+import { User } from './../core/entities';
+import { ModalDirective } from 'angular-bootstrap-md';
+import { UserService } from '../core/services/user.service';
+import { NotificationsComponent } from '../core/notifications/notifications.component';
+
+@Component({
+  selector: 'app-login',
+  templateUrl: './login.component.html',
+  styleUrls: ['./login.component.scss']
+})
+export class LoginComponent implements OnInit {
+  model: User = User.new();
+  @ViewChild('loginModal', {static: true}) loginModal: ModalDirective;
+
+  constructor(
+    private userService: UserService
+  ) {}
+
+  ngOnInit() {
+
+  }
+
+  onSubmit(): void {
+    this.userService.login(this.model).subscribe(() => {
+      NotificationsComponent.success('Connexion réussie.');
+      this.loginModal.hide();
+    }, ex => {
+      console.error('Error during login attempt: ', ex);
+      if (ex.error.status === 400) {
+        NotificationsComponent.error(`Login ou mot de passe incorrect.`);
+      } else {
+        NotificationsComponent.error(`Une erreur technique est survenue :\n${ex.error.message}`);
+      }
+    });
+  }
+
+  show(): void {
+    this.loginModal.show();
+  }
+}
diff --git a/src/main/ts/src/app/service-unavailable/service-unavailable.component.html b/src/main/ts/src/app/service-unavailable/service-unavailable.component.html
new file mode 100644
index 0000000..44277cf
--- /dev/null
+++ b/src/main/ts/src/app/service-unavailable/service-unavailable.component.html
@@ -0,0 +1,18 @@
+<div id="content">
+  <mdb-card>
+    <!--Card image-->
+    <mdb-card-img src="assets/images/service-unavailable.jpg" alt="Service unavailable"></mdb-card-img>
+    <!--Card content-->
+    <mdb-card-body>
+      <!--Title-->
+      <mdb-card-title>
+        <h4>Service indisponible</h4>
+      </mdb-card-title>
+      <!--Text-->
+      <mdb-card-text>
+        Le serveur est actuellement indisponible.<br/>
+        Veuillez contacter l'administrateur.
+      </mdb-card-text>
+    </mdb-card-body>
+  </mdb-card>
+</div>
diff --git a/src/main/ts/src/app/service-unavailable/service-unavailable.component.scss b/src/main/ts/src/app/service-unavailable/service-unavailable.component.scss
new file mode 100644
index 0000000..8bfdb4e
--- /dev/null
+++ b/src/main/ts/src/app/service-unavailable/service-unavailable.component.scss
@@ -0,0 +1,4 @@
+#content {
+  width: 450px;
+  margin: auto;
+}
diff --git a/src/main/ts/src/app/service-unavailable/service-unavailable.component.spec.ts b/src/main/ts/src/app/service-unavailable/service-unavailable.component.spec.ts
new file mode 100644
index 0000000..af01ef0
--- /dev/null
+++ b/src/main/ts/src/app/service-unavailable/service-unavailable.component.spec.ts
@@ -0,0 +1,28 @@
+/* tslint:disable:no-unused-variable */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { DebugElement } from '@angular/core';
+
+import { ServiceUnavailableComponent } from './service-unavailable.component';
+
+describe('ServiceUnavailableComponent', () => {
+  let component: ServiceUnavailableComponent;
+  let fixture: ComponentFixture<ServiceUnavailableComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ ServiceUnavailableComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ServiceUnavailableComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/src/main/ts/src/app/service-unavailable/service-unavailable.component.ts b/src/main/ts/src/app/service-unavailable/service-unavailable.component.ts
new file mode 100644
index 0000000..ee0efba
--- /dev/null
+++ b/src/main/ts/src/app/service-unavailable/service-unavailable.component.ts
@@ -0,0 +1,10 @@
+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-service-unavailable',
+  templateUrl: './service-unavailable.component.html',
+  styleUrls: ['./service-unavailable.component.scss']
+})
+export class ServiceUnavailableComponent {
+  constructor() {}
+}
diff --git a/src/main/ts/src/assets/images/icon-128.png b/src/main/ts/src/assets/images/icon-128.png
new file mode 100644
index 0000000..97ef7f9
Binary files /dev/null and b/src/main/ts/src/assets/images/icon-128.png differ
diff --git a/src/main/ts/src/assets/images/icon-64.png b/src/main/ts/src/assets/images/icon-64.png
new file mode 100644
index 0000000..da14153
Binary files /dev/null and b/src/main/ts/src/assets/images/icon-64.png differ
diff --git a/src/main/ts/src/assets/images/service-unavailable.jpg b/src/main/ts/src/assets/images/service-unavailable.jpg
new file mode 100644
index 0000000..d58efad
Binary files /dev/null and b/src/main/ts/src/assets/images/service-unavailable.jpg differ