# Unable to connect to notebook, terminal, or simulation **URL:** \ **Category:** General Support\ **Tags:** error\ **Created:** [October 23, 2019, 2:24pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165 "2019-10-23T14:24:07Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![elizabeth.wills](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/elizabeth.wills/32/340_2.png) [@elizabeth.wills](https://get-help.theconstruct.ai/u/elizabeth.wills)\ **Post date:** [October 23, 2019, 2:24pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/1 "2019-10-23T14:24:07Z")
I am a new user and thus far have been unable to successfully try any courses. I can load the webpage and the instructions, and get to click through all the 14 little pop ups. After that, no amount of waiting will get the rest of the terminal, simulation, and then the notebook also loses connection. I looked at other issues, and it seems to apply to all courses I have tried, and I am on a stable, wired connection. If this has anything to do with the “non-default” port comments (I am behind a firewall), IT requests more precise information so that we can implement a fix. ![image](https://get-help.robotigniteacademy.com/uploads/default/original/1X/5c95fbd3ba2eb08034cec2dcd817b99396447f44.png) ---
**Author:** ![duckfrost2](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/duckfrost2/32/9365_2.png) [@duckfrost2](https://get-help.theconstruct.ai/u/duckfrost2)\ **Post date:** [October 23, 2019, 2:59pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/2 "2019-10-23T14:59:12Z")
What browser are you using? Do you have the same issue in [ROSDevelopementStudio](https://www.theconstructsim.com/rds-ros-development-studio/)? Have you tried a Tunneling VPN like [TunnelBear](https://www.tunnelbear.com/) of [ExpressVPN](https://www.expressvpn.com/us)? Could you look for the ports that you have open by your firewall? > netstat -lntu Post the output here 😉 ---
**Author:** ![elizabeth.wills](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/elizabeth.wills/32/340_2.png) [@elizabeth.wills](https://get-help.theconstruct.ai/u/elizabeth.wills)\ **Post date:** [October 23, 2019, 3:04pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/3 "2019-10-23T15:04:34Z")
@duckfrost, thank you for your response. Browser is firefox. I do experience a similar issue in ROSDevelopmentStudio: ![image](https://get-help.robotigniteacademy.com/uploads/default/original/1X/6227261f2d6860521b17a30cb7682a55b23eddbf.png) Due to policy, I am not allowed to access the Tunneling VPN. netsat output: Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.53:53 0.0.0.0:\* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:\* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:\* LISTEN tcp 0 0 127.0.0.1:29754 0.0.0.0:\* LISTEN tcp6 0 0 :::22 :::\* LISTEN tcp6 0 0 ::1:631 :::\* LISTEN udp 0 0 127.0.0.53:53 0.0.0.0:\* udp 0 0 0.0.0.0:68 0.0.0.0:\* udp 0 0 0.0.0.0:631 0.0.0.0:\* udp 0 0 0.0.0.0:5353 0.0.0.0:\* udp 0 0 0.0.0.0:39505 0.0.0.0:\* udp6 0 0 :::35754 :::\* udp6 0 0 :::5353 :::\* ---
**Author:** ![duckfrost2](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/duckfrost2/32/9365_2.png) [@duckfrost2](https://get-help.theconstruct.ai/u/duckfrost2)\ **Post date:** [October 23, 2019, 4:47pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/4 "2019-10-23T16:47:04Z")
I see…Hmmm… I’m not the expert in Ports , but it seems some of the most important are NOT open , like the 80 for example. Actually you have very few ports open there I’m affraid. Let me ask around if someone has any solution. ---
**Author:** ![ralves](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/ralves/32/7039_2.png) [@ralves](https://get-help.theconstruct.ai/u/ralves)\ **Post date:** [October 23, 2019, 4:56pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/5 "2019-10-23T16:56:21Z")
Hi @elizabeth.wills, the services on both platforms run in different non-default ports, but we have `nginx` that proxies all services to a common `https (port 443)` port. Given that _all_ firewalls allow ports `443` and `80`, then I think your firewall is blocking `WebSocket Connections`. We use `WebSockets` extensively. Could you check that with your IT team? I think they are allowing `http://` and `https://` protocols, but now allowing `ws://` or `wss://`, which are used for `WebSocket` connections. ---
**Author:** ![elizabeth.wills](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/elizabeth.wills/32/340_2.png) [@elizabeth.wills](https://get-help.theconstruct.ai/u/elizabeth.wills)\ **Post date:** [October 23, 2019, 5:18pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/6 "2019-10-23T17:18:27Z")
Hi @ralves, Thanks for the information. I’ll check in and let you know. ---
**Author:** ![elizabeth.wills](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/elizabeth.wills/32/340_2.png) [@elizabeth.wills](https://get-help.theconstruct.ai/u/elizabeth.wills)\ **Post date:** [October 23, 2019, 8:24pm UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/7 "2019-10-23T20:24:13Z")
@ralves It turns out it was the websocket connection. Thank you for all your help. ---
**Author:** ![ralves](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/ralves/32/7039_2.png) [@ralves](https://get-help.theconstruct.ai/u/ralves)\ **Post date:** [October 24, 2019, 8:36am UTC](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165/8 "2019-10-24T08:36:35Z")
Great to hear that @elizabeth.wills You’re Welcome.