You must change the IP address (don't know which distribution you use otherwise I could tell you which file to edit), then have a look at your Apache configuration and at /root/ispconfig/httpd/conf/httpd.conf and replace the IP address if it is in there, also in /etc/postfix/main.cf, then in /etc/proftpd.conf and its included files (some of them have an IP address in their name so you must change the file name, too), and then in the ISPConfig web interface (under Management -> Server -> Settings). You can then check the ISPConfig MySQL database if the old IP address is still in there and replace it, if necessary.
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