If youcan't fix this immediatly, youcan 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.
Youcan 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).