It happens on all of my sites. Maybe I need to contact tech support at my host?

If you try to upload a file bigger than allowed on your site, do you get the connection error or do you see something saying" sorry the file is too big"?

One thing I did notice is this which is referencing the uu_upload.pl (don't know if this matters or not but this is the address that appears in the browser addy window):

Code:
http://mydomainname.com/cgi-bin/uu_upload.pl?temp_sid=6b7a325c755c95c3b376c92abb088c46
I'm googling this now, it has to do with "file handler" or something... like it's not detecting that the file is too big and returning the person to a page telling them that the file is too big.