Error Backup FTP

I upgraded Plesk 11.5 to the latest version 12.0.08 # 5 and now I can not configure the external FTP backup I get the error:

Transport error: unable to list directory: Curl error: Timeout was reached.

Also failing the backup shows this error:

Unable to rotate dump: The dump rotation is failed with code '126 'at / opt / psa / admin / bin / plesk_agent_manager line 1041.

And this one:

Can not upload file 'domains/domain.tld/backup_domain.tld_info_1406210716.xml' to...

Error Backup FTP