avatars & server log

I tried to upload and then put an avatar on another site.. When govtcheez told me it might be because of tripod preventing d/l's from other sites, I put the file on my webserver and tried from there...

No such luck.. The board grabs the file off the server and then says it's invalid... Why not just check for size and extension and then ban anyone who uses a junk avatar and refuses to replace it? Or keep a handy avatar with "DUMMY" in big neon letters in it for people with bad avatars.

BTW: I'm getting odd requests from the board now... Every 2 minutes or so, my server registers a connect... Here, I'll post the log:

connection requested.
Connection accepted from 64.228.158.188
Request from 64.228.158.188:
Type: GET Uri: /default.ida?XXXXX(many x's here)XXXXX?%u9090%u6858%ucbd3%u7801%u9090%u6856%uc bd3%u7801%u9090%u9090%u9090%u8190%u00c3%u8b00%u531 %u53ff%u0078%u0000%u00=a
Closed connection to 64.228.158.188

connection requested.
Connection accepted from 64.105.118.114
Request from 64.228.105.114:
Type: GET Uri: /default.ida?XXXXX(many x's here)XXXXX?%u9090%u6858%ucbd3%u7801%u9090%u6856%uc bd3%u7801%u9090%u9090%u9090%u8190%u00c3%u8b00%u531 %u53ff%u0078%u0000%u00=a
Closed connection to 64.228.105.114

My server chops off the URI when it gets too long, and I think it happened hree. What is this? The board? Somebody trying to exploit my underpowered server by causing a buffer overrun? What?!?