# Unable to connect to notebook, terminal, or simulation

**URL:** <https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165>\
**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:** 1\
**Showing post:** 5

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**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")

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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.

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_[View the full topic](https://get-help.theconstruct.ai/t/unable-to-connect-to-notebook-terminal-or-simulation/1165)._