diff --git a/docs/docs/user-guide/using-proxy-url.md b/docs/docs/user-guide/using-proxy-url.md
index f69ba65a6a1..452e7a18049 100644
--- a/docs/docs/user-guide/using-proxy-url.md
+++ b/docs/docs/user-guide/using-proxy-url.md
@@ -1,18 +1,19 @@
-# Configure CLI for Microsoft 365 to use Proxy
+# Configure CLI for Microsoft 365 to use a proxy
 
-If you are behind a corporate proxy, you may need to configure the CLI for Microsoft 365 to use a proxy server to access Microsoft 365 services. You can configure a proxy URL using the [cli config set](/docs/docs/cmd/cli/config/config-set.md) command.
+If you are behind a corporate proxy, you'll have to configure CLI for Microsoft 365 to use a proxy server to access Microsoft 365 services. You can configure a proxy URL using the [cli config set](/docs/docs/cmd/cli/config/config-set.md) command.
 
 ## Understanding Proxy URL
 
 Before configuring the proxy, it's important to understand the different parts of a proxy URL. A proxy URL typically consists of the following elements:
 
-- **Protocol**: The protocol used by the proxy server, such as HTTP, HTTPS, or SOCKS.
-- **Username and Password**: If the proxy server requires authentication, you will need to provide a username and password.
-- **Host**: The hostname or IP address of the proxy server.
-- **Port number**: The port number on which the proxy server is listening. Defaults to 80 when not provided.
+- **protocol**: The protocol used by the proxy server, such as `HTTP`, `HTTPS`, or `SOCKS`
+- **username and password**: if the proxy server requires authentication, you will need to provide a username and password
+- **host**: the hostname or IP address of the proxy server
+- **port number**: the port number on which the proxy server is listening. Defaults to 443 for the `HTTPS` protocol, otherwise it defaults to 80 when not provided
 
 ## Configuring Proxy URL
-To configure CLI for Microsoft 365 to use a proxy, you need to execute the m365 cli config set command with the following syntax:
+
+To configure CLI for Microsoft 365 to use a proxy, you need to execute the `m365 cli config set` command with the following syntax:
 
 `m365 cli config set --key proxyUrl --value 'http://username:password@proxy.contoso.com:8080'`
 
diff --git a/src/request.spec.ts b/src/request.spec.ts
index 2f4678d5bac..59b6608f310 100644
--- a/src/request.spec.ts
+++ b/src/request.spec.ts
@@ -437,6 +437,26 @@ describe('Request', () => {
       });
   });
 
+  it('returns response of a successful GET request, with a proxy url and defaults port to 443', (done) => {
+    const config = Cli.getInstance().config as Configstore;
+    sinon.stub(config, 'get').callsFake(() => 'https://proxy.contoso.com');
+
+    sinon.stub(_request as any, 'req').callsFake((options) => {
+      _options = options;
+      return Promise.resolve({ data: {} });
+    });
+
+    _request
+      .get({
+        url: 'https://contoso.sharepoint.com/'
+      })
+      .then(() => {
+        done();
+      }, (err) => {
+        done(err);
+      });
+  });
+
   it('returns response of a successful GET request, with a proxy url with username and password', (done) => {
     const config = Cli.getInstance().config as Configstore;
     sinon.stub(config, 'get').callsFake(() => 'http://username:password@proxy.contoso.com:8080');
diff --git a/src/request.ts b/src/request.ts
index 9c24c85ad05..6b931f116b9 100644
--- a/src/request.ts
+++ b/src/request.ts
@@ -232,7 +232,7 @@ class Request {
   private createProxyConfigFromString(url: string): AxiosProxyConfig {
     const parsedUrl = new URL(url);
     const hostname = parsedUrl.hostname;
-    const port = parsedUrl.port || 80;
+    const port = parsedUrl.port || (url.toLowerCase().startsWith('https') ? 443 : 80);
     let authObject = null;
     if (parsedUrl.username && parsedUrl.password) {
       authObject = {