Like you being your own support forum, I am my own web host 🙂 The server running this site is upstairs in my house.

I have no reverse proxy installed. In terms of Apache config…I’m running four VHosts on the same Apache instance. The only other “strange” thing is I’m using that I can think of is mod_deflate.

This is what I’m seeing in the Bad Behavior log table for Feedster:

http_headers:
GET /feed/ HTTP/1.1
TE: deflate,gzip;q=0.3
Accept-Encoding: gzip, deflate, compress
From: [email protected]
Host: www.kgadams.net
If-Modified-Since: Sun, 21 May 2006 21:26:38 GMT
If-None-Match: "87af99f4cc3f479eaf691ac5697be113"
User-Agent: Feedster Crawler/1.0; Feedster, Inc.

denied_reason:
Header 'TE' present but TE not specified in 'Connection' header

As you mentioned, I’ve observed a couple of rejections for Opera of which the following is an exemplar:
http_headers:

GET /?p=2 HTTP/1.1
Host: www.kgadams.net
User-Agent: Opera/6.03 (Windows 2000; U) [en]
Pragma: no-cache
Accept: */*
Referer: http://www.kgadams.net/?p=2
Max-Forwards: 10

denied_reason:

Header 'Pragma' without 'Cache-Control' prohibited for HTTP/1.1 requests

Thoughts?