Thanks a lot for your advise.
I tried to do $psql -h localhost -p 5432 -U seruser -W ser Connecting database ser is success.
But in the log file, these following lines appeared after SER started using /usr/sbin/ser command. FATAL: Non_superuser connection limit exceeded LOG: pq_recvbuf:unexpected EOF on client connection Maybe this is the reason database doesn't work, I think. It seems SER can't connect to postgres. What should I do?
Another problem: SER processes don't stop using /usr/sbin/ser stop. Many SER processes are surviving. Is it strange?
Most sincerely Takefumi