diff --git a/apps/api/src/admin/admin-registrations.controller.ts b/apps/api/src/admin/admin-registrations.controller.ts
index 8aaae5a..fd1e256 100644
--- a/apps/api/src/admin/admin-registrations.controller.ts
+++ b/apps/api/src/admin/admin-registrations.controller.ts
@@ -1,4 +1,4 @@
-import { Body, Controller, Get, Param, Post, Req, UseGuards } from '@nestjs/common';
+import { Body, Controller, Get, Header, Param, Post, Req, UseGuards } from '@nestjs/common';
 import { Request } from 'express';
 import { JwtAuthGuard } from '../auth/jwt-auth.guard';
 import { RequestUser } from '../common/request-user';
@@ -12,6 +12,9 @@ export class AdminRegistrationsController {
   constructor(private readonly registrations: RegistrationService) {}
 
   @Get()
+  @Header('Cache-Control', 'no-store, no-cache, must-revalidate, proxy-revalidate')
+  @Header('Pragma', 'no-cache')
+  @Header('Expires', '0')
   list() {
     return this.registrations.list();
   }
diff --git a/apps/api/src/lldap/lldap.service.ts b/apps/api/src/lldap/lldap.service.ts
index 0a7cf7d..c264001 100644
--- a/apps/api/src/lldap/lldap.service.ts
+++ b/apps/api/src/lldap/lldap.service.ts
@@ -1,5 +1,6 @@
 import { Injectable, InternalServerErrorException, NotFoundException } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
+import { Ber, BerWriter, Client } from 'ldapts';
 
 interface LldapUserInput {
   username: string;
@@ -70,6 +71,8 @@ export interface LldapAccountUser {
 
 @Injectable()
 export class LldapService {
+  private static readonly passwordModifyOid = '1.3.6.1.4.1.4203.1.11.1';
+
   private cachedHeaders?: { expiresAt: number; headers: Record<string, string> };
 
   constructor(private readonly config: ConfigService) {}
@@ -84,11 +87,17 @@ export class LldapService {
           id: input.username,
           email: input.email,
           displayName: input.displayName,
-          password: input.password,
         },
       },
     );
 
+    try {
+      await this.setPassword(input.username, input.password);
+    } catch (error) {
+      await this.deleteUser(input.username).catch(() => undefined);
+      throw error;
+    }
+
     const defaultGroup = this.config.get<string>('LLDAP_DEFAULT_GROUP');
     if (defaultGroup) {
       await this.addUserToGroup(input.username, defaultGroup);
@@ -96,12 +105,18 @@ export class LldapService {
   }
 
   async setPassword(username: string, password: string): Promise<void> {
-    await this.graphql(
-      `mutation SetPassword($userId: String!, $password: String!) {
-        setPassword(userId: $userId, password: $password)
-      }`,
-      { userId: username, password },
-    );
+    const client = new Client({ url: this.config.getOrThrow<string>('LLDAP_LDAP_URL') });
+    try {
+      await client.bind(this.adminDn(), this.config.getOrThrow<string>('LLDAP_ADMIN_PASSWORD'));
+      await client.exop(
+        LldapService.passwordModifyOid,
+        this.passwordModifyRequestValue(this.userDn(username), password),
+      );
+    } catch (error) {
+      throw new InternalServerErrorException(`LLDAP password change failed: ${this.errorMessage(error)}`);
+    } finally {
+      await client.unbind().catch(() => undefined);
+    }
   }
 
   async updateUser(username: string, input: LldapUserUpdateInput): Promise<void> {
@@ -438,4 +453,30 @@ export class LldapService {
     this.cachedHeaders = { headers, expiresAt: Date.now() + 5 * 60_000 };
     return headers;
   }
+
+  private passwordModifyRequestValue(userDn: string, newPassword: string): Buffer {
+    const writer = new BerWriter();
+    writer.startSequence(Ber.Sequence | Ber.Constructor);
+    writer.writeString(userDn, 0x80);
+    writer.writeString(newPassword, 0x82);
+    writer.endSequence();
+    return writer.buffer;
+  }
+
+  private adminDn(): string {
+    return this.userDn(this.config.getOrThrow<string>('LLDAP_ADMIN_USERNAME'));
+  }
+
+  private userDn(username: string): string {
+    const baseDn = this.config.getOrThrow<string>('LLDAP_BASE_DN');
+    return `uid=${this.escapeDn(username)},ou=people,${baseDn}`;
+  }
+
+  private escapeDn(value: string): string {
+    return value.replace(/[\\,+"<>;=]/g, (char) => `\\${char}`);
+  }
+
+  private errorMessage(error: unknown): string {
+    return error instanceof Error ? error.message : 'unknown error';
+  }
 }
diff --git a/apps/api/src/registration/dto/register.dto.ts b/apps/api/src/registration/dto/register.dto.ts
index 53c9d95..2aeb01d 100644
--- a/apps/api/src/registration/dto/register.dto.ts
+++ b/apps/api/src/registration/dto/register.dto.ts
@@ -1,11 +1,6 @@
-import { IsEmail, IsString, Length, Matches } from 'class-validator';
+import { IsEmail, IsString, Length } from 'class-validator';
 
 export class RegisterDto {
-  @IsString()
-  @Length(3, 64)
-  @Matches(/^[a-zA-Z0-9._-]+$/)
-  username!: string;
-
   @IsEmail()
   email!: string;
 
diff --git a/apps/api/src/registration/registration.service.ts b/apps/api/src/registration/registration.service.ts
index 1446a9b..9707e70 100644
--- a/apps/api/src/registration/registration.service.ts
+++ b/apps/api/src/registration/registration.service.ts
@@ -1,7 +1,7 @@
 import { BadRequestException, ConflictException, Injectable } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { InjectRepository } from '@nestjs/typeorm';
-import { IsNull, Repository } from 'typeorm';
+import { In, IsNull, Repository } from 'typeorm';
 import { AuditService } from '../audit/audit.service';
 import { assertPasswordPolicy } from '../common/password-policy';
 import { decryptSecret, encryptSecret, hashToken, randomToken } from '../common/token.util';
@@ -26,23 +26,24 @@ export class RegistrationService {
 
   async register(dto: RegisterDto, ipAddress?: string, userAgent?: string) {
     assertPasswordPolicy(dto.password);
+    const email = dto.email.toLowerCase();
 
-    const existingLdapUser = await this.lldap.findUserByUsername(dto.username).catch(() => null);
+    const existingLdapUser = await this.lldap.findUserByUsername(email).catch(() => null);
     if (existingLdapUser) {
-      throw new ConflictException('Der Benutzername ist bereits vergeben.');
+      throw new ConflictException('Diese E-Mail-Adresse ist bereits registriert.');
     }
 
     const pending = await this.registrations.findOne({
-      where: { username: dto.username, status: 'pending_email' },
+      where: { username: email, status: 'pending_email' },
     });
     if (pending) {
-      throw new ConflictException('Fuer diesen Benutzernamen existiert bereits eine offene Registrierung.');
+      throw new ConflictException('Fuer diese E-Mail-Adresse existiert bereits eine offene Registrierung.');
     }
 
     const registration = await this.registrations.save(
       this.registrations.create({
-        username: dto.username,
-        email: dto.email.toLowerCase(),
+        username: email,
+        email,
         displayName: dto.displayName,
         encryptedPassword: encryptSecret(dto.password, this.tokenSecret),
         status: 'pending_email',
@@ -99,7 +100,10 @@ export class RegistrationService {
   }
 
   async list() {
-    return this.registrations.find({ order: { createdAt: 'DESC' } });
+    return this.registrations.find({
+      where: { status: In(['pending_email', 'pending_approval']) },
+      order: { createdAt: 'DESC' },
+    });
   }
 
   async approve(id: string, reviewer: string, ipAddress?: string, userAgent?: string) {
diff --git a/apps/web/package.json b/apps/web/package.json
index 4bc5081..e35dda3 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "start": "ng serve --host 0.0.0.0 --port 4200",
+    "start": "ng serve --host 0.0.0.0 --port 4200 --proxy-config proxy.conf.json",
     "build": "ng build",
     "lint": "eslint \"src/**/*.ts\""
   },
diff --git a/apps/web/proxy.conf.json b/apps/web/proxy.conf.json
new file mode 100644
index 0000000..175691e
--- /dev/null
+++ b/apps/web/proxy.conf.json
@@ -0,0 +1,42 @@
+{
+  "/.well-known": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/oidc": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/interaction": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/auth": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/account": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/admin": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/password": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  },
+  "/registration": {
+    "target": "http://localhost:3000",
+    "secure": false,
+    "changeOrigin": true
+  }
+}
diff --git a/apps/web/src/app/pages/admin-registrations.component.ts b/apps/web/src/app/pages/admin-registrations.component.ts
index 2f0fa9b..383bb64 100644
--- a/apps/web/src/app/pages/admin-registrations.component.ts
+++ b/apps/web/src/app/pages/admin-registrations.component.ts
@@ -47,7 +47,12 @@ export class AdminRegistrationsComponent implements OnInit {
   }
 
   private load(): void {
-    this.http.get<any[]>(`${this.apiBaseUrl}/admin/registrations`).subscribe({ next: (items) => this.registrations.set(items), error: (e) => this.error(e) });
+    this.http
+      .get<any[]>(`${this.apiBaseUrl}/admin/registrations`, {
+        headers: { 'Cache-Control': 'no-cache', Pragma: 'no-cache' },
+        params: { _: Date.now() },
+      })
+      .subscribe({ next: (items) => this.registrations.set(items), error: (e) => this.error(e) });
   }
 
   private error(error: unknown): void {
diff --git a/apps/web/src/app/pages/register.component.ts b/apps/web/src/app/pages/register.component.ts
index 8303df0..f6726fa 100644
--- a/apps/web/src/app/pages/register.component.ts
+++ b/apps/web/src/app/pages/register.component.ts
@@ -12,20 +12,14 @@ import { API_BASE_URL } from '../shared/api-base-url';
     <section class="panel wide">
       <h1>Registrieren</h1>
       <form [formGroup]="form" (ngSubmit)="submit()">
-        <div class="grid">
-          <label>
-            Benutzername
-            <input formControlName="username" autocomplete="username">
-          </label>
-          <label>
-            Anzeigename
-            <input formControlName="displayName" autocomplete="name">
-          </label>
-        </div>
         <label>
           E-Mail
           <input type="email" formControlName="email" autocomplete="email">
         </label>
+        <label>
+          Anzeigename
+          <input formControlName="displayName" autocomplete="name">
+        </label>
         <label>
           Passwort
           <input type="password" formControlName="password" autocomplete="new-password">
@@ -55,9 +49,8 @@ export class RegisterComponent {
     @Inject(API_BASE_URL) private readonly apiBaseUrl: string,
   ) {
     this.form = this.fb.nonNullable.group({
-      username: ['', [Validators.required, Validators.minLength(3), Validators.pattern(/^[a-zA-Z0-9._-]+$/)]],
-      displayName: ['', Validators.required],
       email: ['', [Validators.required, Validators.email]],
+      displayName: ['', Validators.required],
       password: ['', [Validators.required, Validators.minLength(12)]],
     });
   }