strange apache log entry

Yesterday I saw this in my logs (apache 2.0.39 acces_log):
::1 - - [10/Aug/2002:00:25:56 +0200] "CONNECT :::2121 HTTP/1.1" 400 267
::1 - - [10/Aug/2002:00:33:31 +0200] "CONNECT :::2121 HTTP/1.1" 400 267

error_log:
[Sat Aug 10 00:25:56 2002] [error] [client ::1] request failed: error
reading the
headers
[Sat Aug 10 00:33:31 2002] [error] [client ::1] request failed: error
reading the
headers

It seems like someone wants to connect to my port 2121 through a proxy. The
strange
thing is, that there isn't any ip. My firewall (SuSEfirewall, an ipchains
based
firewall from suse), didn't log anything, snort didn't log anything too. I
wasn't
able to reproduce this by sending the request manually to port 80.

My question: is this a bug in apache, or what else happened?

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