Subject: solution found
Install apache2 and make the following changes.
/etc/apache2/httpd.conf
DirectoryIndex index.html index.html.var login.nsf
/etc/apache2/httpd.conf
Include /etc/apache2/mod_proxy_html.conf
/etc/apache2/mod_proxy_html.conf
loadModule proxy_module /usr/lib/apache2/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/mod_proxy_http.so
LoadModule headers_module /usr/lib/apache2/mod_headers.so
ProxyRequests off
ProxyPreserveHost On
ProxyPass /login.nsf http://Internal_MailServer/login.nsf
ProxyPassReverse /login.nsf http://Internal_MailServer/login.nsf
ProxyPass /domcfg.nsf http://Internal_MailServer/domcfg.nsf
ProxyPassReverse http://Internal_MailServer/domcfg.nsf /domcfg.nsf
ProxyPass /names.nsf http://Internal_MailServer/names.nsf
ProxyPassReverse http://Internal_MailServer/names.nsf /names.nsf
ProxyPass /domjava/ http://Internal_MailServer/domjava/
ProxyPassReverse http://Internal_MailServer/domjava /domjava/
ProxyPass /mail/ http://Internal_MailServer/mail/
ProxyPassReverse /mail/ http://Internal_MailServer/mail/
ProxyPass /iNotes/ http://Internal_MailServer/iNotes/
ProxyPassReverse /iNotes/ http://Internal_MailServer/iNotes/
ProxyPass /icons/ http://Internal_MailServer/icons/
ProxyPassReverse /icons/ http://Internal_MailServer/icons/