In article <5711630.post@xxxxxxxxxxxxxxx>, RPK <rohitprakash123@xxxxxxxxxxxxxx> wrote: % I tried to modify the parameters of the .CONF file when the pgsql-8.1 % service was running. The next time I started, it displayed error: "The % service did not listen to local host". (something like this). % % So I copied the old DATA folder and un-installed PostgreSQL. I again % re-installed it and replace the new DATA folder with the old one. Both % previous and new are same versions and same settings were used during % installation. I think what you need to do is to fix whatever's wrong with your config file. When you made a copy of the old data folder, you copied the config file with it. When you restored the copy, you restored the config file. Do you have a copy of the version that was used the last time the database started?