I have found a lot of similar problem descriptions here but
none of the proposed solutions worked for me:

I am trying to regularly monitor a certain page containing a
a really long query string (basically a page like a search
engine). 
The string looks like this:
www.stellenblatt.de/stellenblatt/FMPro?-db=staus.fp5&-format=%2fstellenblatt%2fergebnis.htm&-lay=la01&-op=cn&F01=test&-max=100&-find=&-sortfield=F04%20&-sortfield=F02

However, I always get a "Bad request" error. The URL itself
works perfectly when copy&pasted into Opera or Mozilla. The
error occurs only with httrack.

I have set my Browser ID to something "normal", I have
reduced the number of connects to 1, I have enabled cookies
(although this does not seem to be the problem), I have even
tried to escape the minus-signs in the query string by using
the HTML-entity for a minus... Nothing: the error remains.

For testing I have tried to mirror the root of the site
(www.stellenblatt.de) - all the static pages are mirrored
without a problem but all links with query strings run into
the same "bad request" error.

Does anybody have an idea of why this happens? And maybe
even a solution.

Thanks,
Uwe