Plesk 8.1 Update: RBL update fails

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After updating to Plesk 8.1, I encountered the following problem when trying to update "Trend Micro RBL+ Service"

Unable to update superserver configuration file: MailMng->setMapsProtection() failed: mailmng failed: mailmng: popen_exec: command failed code: 1 , 
ERROR while trying to check the hostname
Check the error reason(see log file: /tmp/psa-rblmng-script___reconfiguration.log), fix and try again

0: /usr/local/psa/admin/plib/cmd_rbl.php:51
rbl_configure(string 'true', string 'relays.ordb.org;bl.spamcop.net;sbl-xbl.spamhaus.org;dnsbl.sorbs.net;rhsbl.sorbs.net')
1: /usr/local/psa/admin/htdocs/server/mail.php3:158

in /tmp/psa-rblmng-script___reconfiguration.log:

START psa-rblmng-script-- installing AT Tue Apr 17 17:25:26 SGT 2007

ERROR while trying to check the hostname

STOP psa-rblmng-script-- installing AT Tue Apr 17 17:25:26 SGT 2007

 

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This is bizarre. I've fixed it. Wrong IP address entry in /etc/hosts caused the problem.

The old IP was left over from a move... which has never caused any problems until this upgrade.