MQTT devices not working all of a sudden

Its been a while since i did anything with home assistant so im a little rusty. My MQTT devices all stopped responding in HA dash. They all still work in the TasmoAdmin but not through MQTT. Last time this happened i had to change the MQTT host setting to the IP of my Odroid from the homeassistant.local. But now im at a loss. Any help would be greatly appreciated.

Could a router update cause this perhaps? Is their some kind of port i should open or something?

I think i got it, Had to update mosquito broker.

Always check the HA log first.
If still unclear, show the relevant entries in your post.