Meta setting does not help as IE reads the first instance. which comes from your web server:
HTTP/1.x 200 Ok
Date: Mon, 23 Apr 2007 20:23:23 GMT
Server: Thunderstone-Texis/5.01.1170347731
Content-Type: text/html; charset=ISO-8859-1
Applied and made live..
This:
Content-Type: text/html; charset=ISO-8859-1
Comes before this:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Full explaination of this is here including the priority order in which they are used. It explains why chaning the meta does not help if a server encoding is given. http://www.w3.org/TR/WD-html40-970708/charset.html
Are both boxes running the same versions of software?
Is there any kind of proxy (transparent or otherwise) or load balancer in front of the external appliance?