Robert C Paulsen Jr <robert@paulsenonline.net> writes:
> I added a line to pg_hba.conf:
> host all 192.168.0.0 255.255.255.0 md5
You're a field short ... apparently you are reading pre-7.4
documentation about the format of pg_hba.conf. It's unhappy because
"md5" doesn't look like a valid IP mask.
regards, tom lane