My board has crashed (I didn't do anything!), and is giving this error:

Script:
Line#:
SQL Error: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
Please verify that your MySQL server is running
SQL Error #: 2002
Query: Unable to connect to the database!

Is it correct to assume that this is caused on the host's end, like their server is down? Thank you.

It looks that way. It is telling you that it can not connect to the database for one reason or another.

This can also happen if your config.inc.php file has been corrupted. This file holds all of your settings including your connection to mysql.
HERE is a post from another user that reported the exact same error.

So I would double check the file in question.

BTW, This is the same issue as JAISP stated. "No connection to MYSQL" If this file is corrupted the board does know how to connect to the database.

Also it would be helpful if you added your board url to your profile. So people like me can take a quick peek at the problem.
Sometimes it helps sometimes it doesn't.
But it does save time posting back and forth asking for the url.

Thank you very much for your replies. Here's the error URL: http://www.wheelchairjunkie.com/forums/ubbthreads.php I am able to log into phpMyAdmin, but I can't find a config.inc.php file. It's odd because the board has run flawless for a year, and suddenly it's just showing this error. Thanks again.

Well I can't say for version 6 but for version 7 the file is in includes/config.inc.php.
Looking at the last 6.x download it seems to be the same.

Ruben, if I can access the phpMyAdmin control panel, does that mean it's not the server that's the issue, but my board files? Thanks.

I would probably say yes. If you did read my post link. It could be your server over wrote the config.inc.php file due to out of disk space. A big clue is the file is 0 bytes.
See if you can find the config file. and restore it even if it is out of date the paths.login,password should be correct.

Ruben, my config.inc.php file is 0. Unfortunately, I don't have access to the original files, and my membership expired last month... so I guess I have to buy an upgrade, and go from there. Thanks.

Well,
You may have other options.If you have a old backup you can use it like I said before. You just will need to update it after uploading.
Another option is if you have the original zip file, set up a test board and let it create a new config file and copy it over to the live board.

Or somebody may have a default config file for you to use. But you need to let us know what the version is. Also Rick could rebuild your config file. If you open a support ticket.