Anybody have a clue?
Badly malformed UA with multiple trailing blanks spaces.
157.55.112.zzz - - [06/Mar/2011:10:06:45 -0700] "GET /about.html HTTP/1.1" 403 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4325; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30707; MS-RTC LM 8)"