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Old 17th September 2012, 10:59
till till is online now
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Most likely the mail server is not able to connect to the master server anymore trough mysql. The hostname of the slave servers (in this case the mail server) is part of the mysql user permissions, if you change the hostname of the mail server, it has to be changed in the /etc/hosts files of all servers in your cluster as well, then go trough all tables in the "mysql" MySQL database on the matser server, you will find the old hostname in several records, change all these records with e.g. phpmyadmin to the new hostname and then restart the mysql server on the master server.
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