Too many connections from this host

[ConstantMath]

Hello all, since I use ImageCache, I encounters some connections problems from my mutualised server : it says "Too many connections from this host" (see exact log below). There is a internal limit of 30 simultaneous connections from the same IP on this server. Every time I get an image it consider a new connection so after 30: images are all broken.
Is there a way to bypass that, is my cache system well configured ?

Thanks a lot for your help.

Rejected, too many connections from this host. (vhost:luxembourgartweek.lu uri:/imagecache/large/1555404894-a19-stand-jarmuschek-partner.jpg current:33 limit:30

[ConstantMath]

Hello
I still have the problem, any news on this ?