If you can't fix this immediatly, you can disable Websocket by unchecking "{{% livechat_label disable_websocket_label %}}" in the plugin setting page.In such case, you should also check "{{% livechat_label federation_dont_publish_remotely_label %}}", as chat federation won't work without Websocket.
[OBS](https://obsproject.com) is a popular Free And Open Source streaming software, with advanced capacities for yourlive streams.In the current page, you will find some advices to handle yourlive chats using OBS.
You can use the "{{% livechat_label share_chat_link %}}" feature to generate an URL to your chat.This button should be near the chat if you are the video owner (unless it was desactivated by your server admins).