Question should have been:
Did you made any changes in php.ini or directives before u went to holiday?
"hlds/maps" has something to do with HalfLife servers?
- someone is trying to browse folder on your server?
"web/error/fileNotFound.html" - this is just an error that states that there is no "fileNotFound.html" in "error" folder of web22 client.
- actualy this file is default 404 page from instalation of ISPConfig. I have that file in every client web space - since this is next event after /hlds/maps folder not found, it's occurrence is normal but you should have that file in web/error folder.