SSL auth problem

Good Day

I'm trying to setup SSL auth.

creating CA:

openssl genrsa -out our.key 2048
openssl req -new -key our.key -out our.req
openssl req -x509 -in our.req -text -key our.key -out root.crt

then I copy root.crt on postgresql host and to client host in ~/.postgresql

generating another key on server:

openssl genrsa -out server.key 2048
then request for signing to CA:
openssl req -new -key server.key -out server.req

signing on CA:

openssl req -x509 -in server.req -text -key our.key -out server.crt

now in postgresql data dir following files:

server.crt
server.key
root.crt
and blank root.crl

on client host:

cd ~/.postgresql
openssl genrsa -out postgresql.key 2048
then signing with our.key on CA and placing postgresql.crt, root.crt
to ~/.postgresql

This is my picture of what is happening:

1. we using our CA public key to generate root.crt:

root_signature = ca_pub_key**ca_priv_key % n

2. on postgres server creating key-pair and signing public key on CA, receiving
server_signature (server.crt):

server_signature = server_pub_key**root_priv_key % n

Client using server_signature before encrypting and sending message to server:

server_pub_key = server_signature**root_pub_key % n

if server_pub_key is valid then user encrypting message with server_pub_key.

3. Client generating his own key-pair and asking our CA to sign his public key.

client_signature = client_pub_key**ca_priv_key % n

client_signature he writing to postgresql.crt, which server using when
sending something
to client:

client_pub_key = client_signature**root_pub_key % n

If everything is correct, than why psql complaining:

psql "dbname=me sslmode=require host=postgres_server user=me"
psql: SSL error: certificate verify failed

log on postgres_server:

postgres[98462]: [3-1] LOG: could not accept SSL connection: tlsv1
alert unknown ca

P.S. postgres-8.2 on freebsd
postgresql-client-8.2 on debian