--- title: "Application Installation: Troubleshooting Port 443 Issues" description: Why the Application Can’t Request an Activation Code --- [Skip to content](https://support.block64.com/application-installation-activation-code#main-content) [Customer Portal](https://customerportal.block64.com/tickets-view?hsLang=en) [![Logo - dark](https://support.block64.com/hs-fs/hubfs/Logo%20-%20dark.png?width=350&height=86&name=Logo%20-%20dark.png)](https://support.block64.com/?hsLang=en) - [Home](https://support.block64.com/) - [Insights Portal](https://insights.block64.com/login) - Platform Show submenu for Platform - [Block 64](https://www.block64.com/) - [Why Block 64?](https://www.block64.com/#:~:text=What%20makes%2CBlock%2064%20different) - Solutions Show submenu for Solutions - [Unified Visibility](https://www.block64.com/solutions/unified-visibility) - [Cost Optimization](https://www.block64.com/solutions/cost-optimization) - [Proactive Security](https://www.block64.com/solutions/proactive-security) - [Compliance](https://www.block64.com/solutions/continuous-compliance) - Learn Show submenu for Learn - [Quick Start Guides](https://support.block64.com/getting-started) - [Integrations](https://support.block64.com/documentation#integrations) - [Blog](https://www.block64.com/blog) - Support Show submenu for Support - [Trust Center](https://trust.block64.com/) - [Service Health](https://status.block64.com/) - [Partners](https://www.block64.com/partners) - [Contact Us](https://www.block64.com/contact) - [Pricing](https://www.block64.com/pricing) - [Get Started Free](https://www.block64.com/free-trial) Open main navigation Close main navigation - [Home](https://support.block64.com/) - [Insights Portal](https://insights.block64.com/login) - Platform Show submenu for Platform - [Block 64](https://www.block64.com/) - [Why Block 64?](https://www.block64.com/#:~:text=What%20makes%2CBlock%2064%20different) - Solutions Show submenu for Solutions - [Unified Visibility](https://www.block64.com/solutions/unified-visibility) - [Cost Optimization](https://www.block64.com/solutions/cost-optimization) - [Proactive Security](https://www.block64.com/solutions/proactive-security) - [Compliance](https://www.block64.com/solutions/continuous-compliance) - Learn Show submenu for Learn - [Quick Start Guides](https://support.block64.com/getting-started) - [Integrations](https://support.block64.com/documentation#integrations) - [Blog](https://www.block64.com/blog) - Support Show submenu for Support - [Trust Center](https://trust.block64.com/) - [Service Health](https://status.block64.com/) - [Partners](https://www.block64.com/partners) - [Contact Us](https://www.block64.com/contact) - [Pricing](https://www.block64.com/pricing) - [Get Started Free](https://www.block64.com/free-trial) - - [Customer Portal](https://customerportal.block64.com/tickets-view) - [Submit a Support Request](https://support.block64.com/kb-tickets/new) [Submit a Support Request](https://support.block64.com/kb-tickets/new?hsLang=en) How can we assist you today? - There are no suggestions because the search field is empty. 1. [Block 64 Support Center](https://support.block64.com/?hsLang=en) 2. [Troubleshooting](https://support.block64.com/troubleshooting?hsLang=en) 3. [Discovery: Block 64 Application](https://support.block64.com/troubleshooting?hsLang=en#discovery-block-64-application) # Application Installation: Troubleshooting Port 443 Issues ## Why the Application Can’t Request an Activation Code When the application confirms that the entered email address matches a completed sign-up, it contacts our servers to request an activation code using **Port 443**. This port is essential as it handles secure web traffic using the **HTTPS protocol**. However, if the application cannot send data via Port 443, consider the following common issues: ### 1. Firewall Restrictions - Firewalls may block outgoing traffic on Port 443 to prevent unauthorized data transfer. - Ensure the application is allowed through firewall rules. ### 2. Network Errors - Issues like DNS resolution failures, incorrect IP configurations, or general connectivity problems can prevent data transmission. - Confirm proper network settings and troubleshoot any connectivity issues. ### 3. Security Software Interference - Anti-virus or security software may block the application if flagged as a potential threat. - Add the application to the exception list or temporarily disable the software to test connectivity. By identifying and addressing these factors, you can restore the application's ability to send data via Port 443. --- ### **Troubleshooting Email Delivery Issues for Activation Codes** If the application successfully sends data via Port 443 but the activation code email hasn't arrived, follow these steps: #### 1. Check Junk/Spam Folder - Activation emails may be mistakenly flagged as spam. - Locate and mark the email as "Not Spam" to ensure future delivery to your inbox. #### 2. Add to Whitelist - Some email providers block unfamiliar addresses. - Add **block64.com** to your email provider's whitelist or approved sender list. #### 3. Allow for Delivery Delays - Email delays may occur due to server issues or high traffic. - Wait a reasonable amount of time before attempting further actions. --- ### **How to test 443 connectivity to the Combine** Follow these steps to check if your host machine can establish a connection to **Combine** using **Port 443**: 1. **Open PowerShell** on the host machine. 2. Type the following command: tnc combine.block64.com -port 443 3. **Press Enter** to run the test. #### Understanding the Results: - **Successful Connection:** - You will see a result with **`TcpTestSucceeded: True`**, indicating the host machine can successfully connect to Combine via Port 443. ![](https://support.block64.com/hs-fs/hubfs/Knowledge%20Base%20Import/14678805124631.png?width=470&height=148&name=14678805124631.png) - **Failed Connection:** - A warning message will appear with **`TcpTestSucceeded: False`**. ![](https://support.block64.com/hs-fs/hubfs/Knowledge%20Base%20Import/gj8KkjyGESKxYJPb10tPfCDmz.png?width=470&height=213&name=gj8KkjyGESKxYJPb10tPfCDmz.png) - This suggests a blockage in the outbound connection. #### Troubleshooting: - Verify if any **firewalls** or **network policies** are blocking outbound traffic on **Port 443**. - Check with your **network administrator** for further assistance if necessary. --- ### **Activation code not received: Forced SSL Inspection** #### Why is this error occurring? During the deployment of our Block 64 Discovery Application you may encounter an issue where the activation code is not being triggered to your inbox.  This can be caused by a **rejection of a self-signed SSL certificate**.  Typically, a firewall that has **forced SSL Inspection** on endpoint outbound communication will cause this rejection from our Combine portal.  #### How do I resolve this issue? Depending on the manufacturer of your firewall, there will be different configuration steps to allow the host-machine to bypass the SSL Inspection. 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