Restore and Backup PG8.4 tp 9.4

hi ,

i have been restoring my old server pg8.4 with this command in Ubuntu 15.04

*pg_dump -i -h localhost -p 5432 -U postgres -F c -b -v -f
"10.70.0.61.backup" **myDb*

i try to import this backup in my new server pg 9.4 with this command

*pg_restore -i -h localhost -p 5432 -U postgres -d **myDb** -v
"10.70.0.61.backup"*

the backup worked fine but in restoring i get this error !

*pg_restore: connecting to database for restore*
*pg_restore: [archiver (db)] connection to database "**myDb**" failed:
FATAL: Ident authentication failed for user "postgres"*
*pg_restore: *** aborted because of error*

what is the problem please ?
--
*Mohamed MANSOUR*
Eléve Ingenieur / Développeur .Net
( + 216 ) 52 958 794