Can anyone tell me what causes this?

[Earnie Dyke]

[Tue Feb 21 10:36:39 2006] [3476:3868] [info]  jk_open_socket::jk_connect.c 
(183): connect() failed errno = 55
 
I get this on some requests but not all.  I have two workers loadbalanced with 
stick session =1.
 
Earnie!