--- title: "FAQ: I am installing the ARMS Client and it installed fine but when I go to Open it nothing comes up. It shows in task manager as being opened though, how do I resolve?" description: "FAQ: I am installing the ARMS Client and it installed fine but when I go to Open it nothing comes up. It shows in task manager as being opened though, how do I resolve?" --- [Skip to content](https://kb.arms.com/arms/faq-i-am-installing-the-arms-client-and-it-installed-fine-but-when-i-go-to-open-it-nothing-comes-up.-it-shows-in-task-manager-as-being-opened-though-how-do-i-resolve#main-content) English Show submenu for translations ![](https://kb.arms.com/hubfs/ARMS-Logotype_horizontal-transparent_background-light_mode.svg) Open main navigation Close main navigation - English Show submenu for translations - [Customer Portal](https://helpdesk.arms.com/tickets) [Customer Portal](https://helpdesk.arms.com/tickets?hsLang=en) How can we help you? - There are no suggestions because the search field is empty. 1. [ARMS](https://kb.arms.com/arms?hsLang=en) 2. [Administrator](https://kb.arms.com/arms/administrator?hsLang=en) 3. [Administrator FAQs - Error Messages/Troubleshooting](https://kb.arms.com/arms/administrator?hsLang=en#administrator-faqs-error-messages-troubleshooting) # FAQ: I am installing the ARMS Client and it installed fine but when I go to Open it nothing comes up. It shows in task manager as being opened though, how do I resolve? This behavior has one main cause, the ports to your server’s firewall not being opened. To confirm this is the case you can run a Telnet from your machine to the server. Use the Command Prompt again to “telnet” your server across ports 5555 and then 9000. If the Command Prompt does not recognize this command, then you can turn it on in Control Panel. Open Control Panel \> Programs and Features \> Turn Windows Features on or off. Scroll down to Telnet Client and enable it with the checkbox.  ![Graphical user interface, text, application Description automatically generated](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/43379367827/original/BwHDCkCVCA-00J1gsxUXBS3IzVRSiP-ybQ.png?1671024304) You can now telnet via the Command Prompt. Type “telnet \[SERVER\_NAME\] 5555” but replace SERVER\_NAME with your server’s name and hit Enter. Type “telnet \[SERVER\_NAME\] 9000” but replace SERVER\_NAME with the actual server’s name and hit enter, just like before.  If the Telnet goes through, then the ports are open, and your server is good to go. If it does not go through your services may be down on your server or the ports have been blocked by the firewall. 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