In what instances is this the case?  My -current system (built about 10 
minutes before this commit) works fine with

 telnet 127.0.0.1 80

at least.

On Friday 17 December 2004 16:54, Christos Zoulas wrote:
> Module Name: src
> Committed By: christos
> Date:  Fri Dec 17 22:54:52 UTC 2004
>
> Modified Files:
>  src/sys/netinet: ip_input.c tcp_subr.c udp_usrreq.c
>
> Log Message:
> Turn checksumming on loopback back on until we fix the bugs in it.
> Connect over tcp on the loopback is broken:
>
>   4729 amq      0.000007 CALL  connect(4,0x804f2a0,0x1c)
>   4729 amq      75.007420 RET   connect -1 errno 60 Connection timed out
>
>
> To generate a diff of this commit:
> cvs rdiff -r1.206 -r1.207 src/sys/netinet/ip_input.c
> cvs rdiff -r1.174 -r1.175 src/sys/netinet/tcp_subr.c
> cvs rdiff -r1.125 -r1.126 src/sys/netinet/udp_usrreq.c
>
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.