Did you installed Postgres in a new user, like suggested in the Installation Wizard?
I'm was having a problem like yours in Windows Server 2008, so I deleted and created the user Postgres, put it into "Advanced Users" and worked fine.
Rafael
On Fri, Mar 27, 2009 at 8:38 PM, Nagle, Gail A (US SSA)
<gail.nagle@baesystems.com> wrote:
When installing 8.3 on Vista, we are having a problem when we change the pg_hba.conf file to allow trust authentication. This worked fine on Windows XP. However, after making the change and stopping/restarting the service, we see an error in the Windows Event Viewer that says it no longer cannot open the pg_hba.conf file, permission denied. Vista also seems to lock these config files in a way that prevents them from being removed even after uninstalling postgres. Has anyone encountered this problem and found a solution? Thank you.
The relevant part of the file now looks like this:
# TYPE DATABASE USER CIDR-ADDRESS METHOD
# IPv4 local connections:
#host all all 127.0.0.1/32 md5
host all all 127.0.0.1/32 trust
# IPv6 local connections:
#host all all ::1/128 md5