[No Limit]

I just rebooted the server and its working now. Weird.

Any possible ideas at what could have happened? I was on my forum when I saw the IP 150.70.64.203 online. Since its a new board Im curious to see who is online so I googled the IP, says it was registered to trend micro. Shortly after I started getting database errors from this IP in my email, here is one:

Database error in vBulletin 4.1.1:

Invalid SQL:
SELECT SQL_CALC_FOUND_ROWS node.nodeid AS itemid ,(node.nodeleft = 1) AS isroot, node.nodeid, node.contenttypeid, node.contentid, node.url, node.parentnode, node.styleid, node.userid,
node.layoutid, node.publishdate, node.setpublish, node.issection, parent.permissionsfrom as parentpermissions,
node.showrating,
node.permissionsfrom, node.publicpreview, node.shownav, node.hidden, node.nosearch


FROM cms_node AS node
LEFT JOIN cms_node AS parent ON parent.nodeid = node.parentnode INNER JOIN cms_nodecategory AS nodecat ON nodecat.nodeid = node.nodeid
AND nodecat.categoryid = 51

WHERE node.new != 1 AND ( (node.permissionsfrom IN (-1)) OR ( node.permissionsfrom in (1) AND (node.parentnode IN (1,142,157) OR node.nodeid = 1) AND
node.setpublish > 0 AND node.publishdate < 1299706884 ))AND node.new != 1 AND node.hidden = 0
AND node.contenttypeid <> 17
ORDER BY node.setpublish DESC, node.publishdate DESC LIMIT 0, 7;

MySQL Error : Can't create/write to file '/tmp/#sql_5ce1_0.MYD' (Errcode: 23)
Error Number : 1
Request Date : Wednesday, March 9th 2011 @ 04:41:24 PM
Error Date : Wednesday, March 9th 2011 @ 04:41:30 PM
Script : http://www.leftunderground.com/list/...n_md5.js?v=411
Referrer :
IP Address : 150.70.64.203
Username : Unregistered
Classname : vB_Database
MySQL Version :

Then a few minutes after that the entire site stopped working.

Edit: As I wrote this saw the same IP had opened up 10 connections to the site (according to the who is online list). I banned him using the firewall on the server. I am running 4.1.1 so I guess this is a good time to update. Any known issues in 4.1.1 that would allow something like this to occur?