Only those using mod_geoip are probably familiar with this one, it happens when mod_geoip gives a region that has some of the extended characters in it. I tried posting an example but the forum wouldn't accept it. It is not a bug in the module but in Apache. I have a fix for it, requires a libhttpd.dll change is all.
If you would like it, sound off! Our binaries now say "unmodified" Apache & OpenSSL sources, that will remain. But I'm not against providing a fixed DLL separate of our normal binary packages. I was hoping it would make 2.2.21 but it did not.
Said fix is already in 2.3.14. On a side note, expect a 2.3.15 soon to deal with the killapache range DOS quagmire, till then you're only hope is to use the mod_rangecnt I have linked to in here somewhere. If 2.3.15 is not in the next week I may break policy and post up a dev version, like the one I've started using today. It's important enough in my opinion.