diff --git a/packages/angular_devkit/build_angular/src/builders/dev-server/specs/works_spec.ts b/packages/angular_devkit/build_angular/src/builders/dev-server/specs/works_spec.ts
index 90ef75c2274b..edac384cca34 100644
--- a/packages/angular_devkit/build_angular/src/builders/dev-server/specs/works_spec.ts
+++ b/packages/angular_devkit/build_angular/src/builders/dev-server/specs/works_spec.ts
@@ -34,7 +34,7 @@ describe('Dev Server Builder', () => {
     expect(output.success).toBe(true);
 
     // When webpack-dev-server doesn't have `contentBase: false`, this will serve the repo README.
-    const response = await fetch('http://localhost:4200/README.md', {
+    const response = await fetch(`http://localhost:${output.port}/README.md`, {
       headers: {
         'Accept': 'text/html',
       },
diff --git a/packages/angular_devkit/build_angular/test/hello-world-app/protractor.conf.js b/packages/angular_devkit/build_angular/test/hello-world-app/protractor.conf.js
index 9b57663994c9..8526d6983af4 100644
--- a/packages/angular_devkit/build_angular/test/hello-world-app/protractor.conf.js
+++ b/packages/angular_devkit/build_angular/test/hello-world-app/protractor.conf.js
@@ -23,7 +23,7 @@ exports.config = {
     },
   },
   directConnect: true,
-  baseUrl: 'http://localhost:4200/',
+  baseUrl: 'http://localhost:0/',
   framework: 'jasmine',
   jasmineNodeOpts: {
     showColors: true,
diff --git a/packages/schematics/angular/e2e/files/protractor.conf.js.template b/packages/schematics/angular/e2e/files/protractor.conf.js.template
index 361e7f0cdfa1..fae06960cf8a 100644
--- a/packages/schematics/angular/e2e/files/protractor.conf.js.template
+++ b/packages/schematics/angular/e2e/files/protractor.conf.js.template
@@ -17,7 +17,7 @@ exports.config = {
   },
   directConnect: true,
   SELENIUM_PROMISE_MANAGER: false,
-  baseUrl: 'http://localhost:4200/',
+  baseUrl: 'http://localhost:0/',
   framework: 'jasmine',
   jasmineNodeOpts: {
     showColors: true,
diff --git a/tests/legacy-cli/e2e/assets/12.0-project/e2e/protractor.conf.js b/tests/legacy-cli/e2e/assets/12.0-project/e2e/protractor.conf.js
index f07dcd519768..878ab4375bf4 100644
--- a/tests/legacy-cli/e2e/assets/12.0-project/e2e/protractor.conf.js
+++ b/tests/legacy-cli/e2e/assets/12.0-project/e2e/protractor.conf.js
@@ -14,7 +14,7 @@ exports.config = {
     browserName: 'chrome',
   },
   directConnect: true,
-  baseUrl: 'http://localhost:4200/',
+  baseUrl: 'http://localhost:0/',
   framework: 'jasmine',
   jasmineNodeOpts: {
     showColors: true,
diff --git a/tests/legacy-cli/e2e/assets/13.0-project/e2e/protractor.conf.js b/tests/legacy-cli/e2e/assets/13.0-project/e2e/protractor.conf.js
index f07dcd519768..878ab4375bf4 100644
--- a/tests/legacy-cli/e2e/assets/13.0-project/e2e/protractor.conf.js
+++ b/tests/legacy-cli/e2e/assets/13.0-project/e2e/protractor.conf.js
@@ -14,7 +14,7 @@ exports.config = {
     browserName: 'chrome',
   },
   directConnect: true,
-  baseUrl: 'http://localhost:4200/',
+  baseUrl: 'http://localhost:0/',
   framework: 'jasmine',
   jasmineNodeOpts: {
     showColors: true,
diff --git a/tests/legacy-cli/e2e/tests/basic/e2e.ts b/tests/legacy-cli/e2e/tests/basic/e2e.ts
index 320ae22682ac..f4f1c3b42dfa 100644
--- a/tests/legacy-cli/e2e/tests/basic/e2e.ts
+++ b/tests/legacy-cli/e2e/tests/basic/e2e.ts
@@ -5,6 +5,6 @@ export default async function () {
   await expectToFail(() => silentNg('e2e', 'test-project', '--dev-server-target='));
 
   // These should work.
-  await silentNg('e2e', 'test-project');
-  await silentNg('e2e', 'test-project', '--dev-server-target=test-project:serve');
+  await silentNg('e2e', '--port=0', 'test-project');
+  await silentNg('e2e', '--port=0', 'test-project', '--dev-server-target=test-project:serve');
 }
diff --git a/tests/legacy-cli/e2e/tests/basic/standalone.ts b/tests/legacy-cli/e2e/tests/basic/standalone.ts
index 204d0572f87f..74ac69b0f97c 100644
--- a/tests/legacy-cli/e2e/tests/basic/standalone.ts
+++ b/tests/legacy-cli/e2e/tests/basic/standalone.ts
@@ -54,5 +54,5 @@ export default async function () {
   await ng('build');
 
   // Perform the default E2E tests
-  await ng('e2e', 'test-project');
+  await ng('e2e', '--port=0', 'test-project');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/lazy-load-syntax.ts b/tests/legacy-cli/e2e/tests/build/lazy-load-syntax.ts
index 62f3cf294ba1..ba02dcaa369f 100644
--- a/tests/legacy-cli/e2e/tests/build/lazy-load-syntax.ts
+++ b/tests/legacy-cli/e2e/tests/build/lazy-load-syntax.ts
@@ -98,6 +98,6 @@ export default async function () {
   // Both Ivy and View Engine should support it.
   await replaceLoadChildren(`() => import('./lazy/lazy.module').then(m => m.LazyModule)`);
 
-  await ng('e2e');
-  await ng('e2e', '--configuration=production');
+  await ng('e2e', '--port=0');
+  await ng('e2e', '--port=0', '--configuration=production');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-aot.ts b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-aot.ts
index c20142e4a229..72b038f1176c 100644
--- a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-aot.ts
+++ b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-aot.ts
@@ -8,6 +8,6 @@ export default async function () {
   await ng('build', 'my-lib', '--configuration=development');
 
   // Check that the e2e succeeds prod and non prod mode
-  await ng('e2e', '--configuration=production');
-  await ng('e2e', '--configuration=development');
+  await ng('e2e', '--port=0', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=development');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-jit.ts b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-jit.ts
index 070fc614f9f8..2983b9f97bc2 100644
--- a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-jit.ts
+++ b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-full-jit.ts
@@ -17,8 +17,8 @@ export default async function () {
   });
 
   // Check that the e2e succeeds prod and non prod mode
-  await ng('e2e', '--configuration=production');
-  await ng('e2e', '--configuration=development');
+  await ng('e2e', '--port=0', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=development');
 
   // Validate that sourcemaps for the library exists.
   await ng('build', '--configuration=development');
diff --git a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-aot.ts b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-aot.ts
index 647e8b1ee9b7..57ddb7fe01a2 100644
--- a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-aot.ts
+++ b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-aot.ts
@@ -8,6 +8,6 @@ export default async function () {
   await ng('build', 'my-lib', '--configuration=production');
 
   // Check that the e2e succeeds prod and non prod mode
-  await ng('e2e', '--configuration=production');
-  await ng('e2e', '--configuration=development');
+  await ng('e2e', '--port=0', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=development');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-jit.ts b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-jit.ts
index 6c13b5468f2a..b714eb4c564d 100644
--- a/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-jit.ts
+++ b/tests/legacy-cli/e2e/tests/build/library/lib-consumption-partial-jit.ts
@@ -16,6 +16,6 @@ export default async function () {
   });
 
   // Check that the e2e succeeds prod and non prod mode
-  await ng('e2e', '--configuration=production');
-  await ng('e2e', '--configuration=development');
+  await ng('e2e', '--port=0', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=development');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/material.ts b/tests/legacy-cli/e2e/tests/build/material.ts
index a010ea834791..5e876a32bbe4 100644
--- a/tests/legacy-cli/e2e/tests/build/material.ts
+++ b/tests/legacy-cli/e2e/tests/build/material.ts
@@ -77,5 +77,5 @@ export default async function () {
   `,
   );
 
-  await ng('e2e', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=production');
 }
diff --git a/tests/legacy-cli/e2e/tests/build/worker.ts b/tests/legacy-cli/e2e/tests/build/worker.ts
index a930a8ce3ff2..3e3e8a0637c9 100644
--- a/tests/legacy-cli/e2e/tests/build/worker.ts
+++ b/tests/legacy-cli/e2e/tests/build/worker.ts
@@ -51,5 +51,5 @@ export default async function () {
   `,
   );
 
-  await ng('e2e');
+  await ng('e2e', '--port=0');
 }
diff --git a/tests/legacy-cli/e2e/tests/commands/e2e/e2e-and-serve.ts b/tests/legacy-cli/e2e/tests/commands/e2e/e2e-and-serve.ts
index 6333c05be279..97fbd3199ead 100644
--- a/tests/legacy-cli/e2e/tests/commands/e2e/e2e-and-serve.ts
+++ b/tests/legacy-cli/e2e/tests/commands/e2e/e2e-and-serve.ts
@@ -5,7 +5,7 @@ export default async function () {
   try {
     // Should run side-by-side with `ng serve`
     await ngServe();
-    await silentNg('e2e');
+    await silentNg('e2e', '--port=0');
   } finally {
     killAllProcesses();
   }
diff --git a/tests/legacy-cli/e2e/tests/commands/e2e/multiple-specs.ts b/tests/legacy-cli/e2e/tests/commands/e2e/multiple-specs.ts
index c7da20adf900..be236ff9b802 100644
--- a/tests/legacy-cli/e2e/tests/commands/e2e/multiple-specs.ts
+++ b/tests/legacy-cli/e2e/tests/commands/e2e/multiple-specs.ts
@@ -8,6 +8,7 @@ export default async function () {
 
   await silentNg(
     'e2e',
+    '--port=0',
     'test-project',
     '--specs',
     './e2e/renamed-app.e2e-spec.ts',
diff --git a/tests/legacy-cli/e2e/tests/commands/e2e/protractor-config.ts b/tests/legacy-cli/e2e/tests/commands/e2e/protractor-config.ts
index 52e9494e4062..9d25d26d2b0e 100644
--- a/tests/legacy-cli/e2e/tests/commands/e2e/protractor-config.ts
+++ b/tests/legacy-cli/e2e/tests/commands/e2e/protractor-config.ts
@@ -4,5 +4,10 @@ import { silentNg } from '../../../utils/process';
 export default async function () {
   // Should accept different config file
   await moveFile('./e2e/protractor.conf.js', './e2e/renamed-protractor.conf.js');
-  await silentNg('e2e', 'test-project', '--protractor-config=e2e/renamed-protractor.conf.js');
+  await silentNg(
+    'e2e',
+    '--port=0',
+    'test-project',
+    '--protractor-config=e2e/renamed-protractor.conf.js',
+  );
 }
diff --git a/tests/legacy-cli/e2e/tests/commands/e2e/suite.ts b/tests/legacy-cli/e2e/tests/commands/e2e/suite.ts
index 519ed63a71bb..ad91a579a8cb 100644
--- a/tests/legacy-cli/e2e/tests/commands/e2e/suite.ts
+++ b/tests/legacy-cli/e2e/tests/commands/e2e/suite.ts
@@ -12,5 +12,5 @@ export default async function () {
         },
     `,
   );
-  await silentNg('e2e', 'test-project', '--suite=app');
+  await silentNg('e2e', '--port=0', 'test-project', '--suite=app');
 }
diff --git a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-es2015-e2e.ts b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-es2015-e2e.ts
index 9a5943043ffd..2b11bb092695 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-es2015-e2e.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-es2015-e2e.ts
@@ -7,6 +7,6 @@ export default async function () {
 
   for (const { lang } of langTranslations) {
     // Execute Application E2E tests with dev server
-    await ng('e2e', `--configuration=${lang}`, '--port=0');
+    await ng('e2e', '--port=0', `--configuration=${lang}`, '--port=0');
   }
 }
diff --git a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-locale-data-augment.ts b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-locale-data-augment.ts
index 8c27229fc4cf..04a5ebdee45a 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-locale-data-augment.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-locale-data-augment.ts
@@ -40,6 +40,6 @@ export default async function () {
     await expectFileToMatch(`${outputPath}/vendor.js`, lang);
 
     // Execute Application E2E tests with dev server
-    await ng('e2e', `--configuration=${lang}`, '--port=0');
+    await ng('e2e', '--port=0', `--configuration=${lang}`);
   }
 }
diff --git a/tests/legacy-cli/e2e/tests/misc/browsers.ts b/tests/legacy-cli/e2e/tests/misc/browsers.ts
index c6a01b2552ba..fa045a9d6644 100644
--- a/tests/legacy-cli/e2e/tests/misc/browsers.ts
+++ b/tests/legacy-cli/e2e/tests/misc/browsers.ts
@@ -46,6 +46,7 @@ export default async function () {
     // Execute application's E2E tests with SauceLabs
     await ng(
       'e2e',
+      '--port=0',
       'test-project',
       '--protractor-config=e2e/protractor-saucelabs.conf.js',
       '--dev-server-target=',
diff --git a/tests/legacy-cli/e2e/tests/misc/e2e-host.ts b/tests/legacy-cli/e2e/tests/misc/e2e-host.ts
index 398beb0599e5..58c71c6912f1 100644
--- a/tests/legacy-cli/e2e/tests/misc/e2e-host.ts
+++ b/tests/legacy-cli/e2e/tests/misc/e2e-host.ts
@@ -19,6 +19,6 @@ export default async function () {
     appArchitect.serve.options.host = host;
   });
 
-  await ng('e2e');
-  await ng('e2e', '--host', host);
+  await ng('e2e', '--port=0');
+  await ng('e2e', '--port=0', '--host', host);
 }
diff --git a/tests/legacy-cli/e2e/tests/misc/http-headers.ts b/tests/legacy-cli/e2e/tests/misc/http-headers.ts
index 4f5ff6949621..242c06241c14 100644
--- a/tests/legacy-cli/e2e/tests/misc/http-headers.ts
+++ b/tests/legacy-cli/e2e/tests/misc/http-headers.ts
@@ -26,7 +26,7 @@ export default async function () {
 
   let errorMessage: string | null = null;
   try {
-    await ng('e2e');
+    await ng('e2e', '--port=0');
   } catch (error) {
     errorMessage = error instanceof Error ? error.message : null;
   }
diff --git a/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts b/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
index f57580ff2b5e..78f6c9596010 100644
--- a/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
+++ b/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
@@ -165,5 +165,5 @@ export default async function () {
   });
 
   // Run the e2e tests against a production build.
-  await ng('e2e', '--configuration=production');
+  await ng('e2e', '--port=0', '--configuration=production');
 }
diff --git a/tests/legacy-cli/e2e/tests/misc/trusted-types.ts b/tests/legacy-cli/e2e/tests/misc/trusted-types.ts
index 4efb8b9f70e3..b1289f204040 100644
--- a/tests/legacy-cli/e2e/tests/misc/trusted-types.ts
+++ b/tests/legacy-cli/e2e/tests/misc/trusted-types.ts
@@ -69,7 +69,7 @@ export default async function () {
     });
 
     try {
-      await ng('e2e');
+      await ng('e2e', '--port=0');
     } catch (error) {
       console.error(`Test case AOT ${aot} with CSP header ${csp} failed.`);
       throw error;
diff --git a/tests/legacy-cli/e2e/tests/update/update.ts b/tests/legacy-cli/e2e/tests/update/update.ts
index 25812d3045a5..1507483d4176 100644
--- a/tests/legacy-cli/e2e/tests/update/update.ts
+++ b/tests/legacy-cli/e2e/tests/update/update.ts
@@ -79,8 +79,8 @@ export default async function () {
   await ng('generate', 'component', 'my-comp');
   await ng('test', '--watch=false');
 
-  await ng('e2e');
-  await ng('e2e', '--configuration=production');
+  await ng('e2e', '--port=0');
+  await ng('e2e', '--port=0', '--configuration=production');
 
   // Verify project now creates bundles
   await noSilentNg('build', '--configuration=production');