pgpool2 frontend cannot connect to postgresql server backend

[songqi at ucha.cn]

I has two backend server: 

localhost 5432

localhost 5433

 

pgpools listen on localhost:9999

 

but when I use psql -h localhost -u postgres -W -p 9999,

it's always dislay the fllowing error:

"

psql: server closed the connection unexpectedly

        This probably means the server terminated abnormally

        before or while processing the request.

"

enable debug log, an error appears:

"do_md5failed in slot 1"

 

OS: ubuntu 8.04

Postgres: 8.3.9

Pgpool2: 1.3-1

 

 

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