amrecover: NAK: unknown service: amindexd

We have an Amanda backup server running 2.4.4, we are able to run amrecover on this system:

# amrecover Daily
AMRECOVER Version 2.4.4p3. Contacting server on localhost ...
220 vpinew AMANDA index server (2.4.4p3) ready.
200 Access OK
Setting restore date to today (2008-01-04)
200 Working date set to 2008-01-04.
501 Could not read disk file /etc/amanda/Daily/disklist!
amrecover>

But when we try to run amrecover on a new backup client, it gives us these errors:

# amrecover Daily
AMRECOVER Version 2.5.1p1. Contacting server on backup.videopropulsion.com ...
NAK: unknown service: amindexd

The /etc/amanda/amanda-client.conf file contains:

conf "Daily"
index_server "backup.videopropulsion.com"
tape_server "backup.videopropulsion.com"
tapedev "file:/var/backup/Daily"
auth "bsd"

The amrecover*debug file under /var/log/amanda/client/Daily contains:

amrecover: debug 1 pid 6436 ruid 0 euid 0: start at Fri Jan 4 13:46:20 2008
Reading conf file "/etc/amanda/amanda-client.conf".
Reading conf file "/etc/amanda/Daily/amanda-client.conf".
amrecover: debug 1 pid 6436 ruid 0 euid 0: rename at Fri Jan 4 13:46:20 2008
security_getdriver(name=bsd) returns 0x2aae49348fa0
security_handleinit(handle=0x515710, driver=0x2aae49348fa0 (BSD))
amrecover: bind_portrange2: Try port 846: Available - Success
amrecover: dgram_bind: socket bound to 0.0.0.0.846
amrecover: dgram_send_addr(addr=0x7fff61aad0b0, dgram=0x2aae4934ac88)
amrecover: (sockaddr_in *)0x7fff61aad0b0 = { 2, 10080, 192.133.120.4 }
amrecover: dgram_send_addr: 0x2aae4934ac88->socket = 3
amrecover: dgram_recv(dgram=0x2aae4934ac88, timeout=0, fromaddr=0x2aae4935ac80)
amrecover: (sockaddr_in *)0x2aae4935ac80 = { 2, 10080, 192.133.120.4 }
security_close(handle=0x515710, driver=0x2aae49348fa0 (BSD))

NOTE: /etc/amanda/Daily/amanda-client.conf is a empty file.

The old backup server doesn't have any auth= lines in the amanda.conf file.

Can we use then newer Amanda client programs (2.5.1) to recover files from an older Amanda Backup server (2.4.4)?

If we should be able to use the newer Amanda client programs, what do we need to do to resolve this problem?

Amanda 2.4.4 has been able to create backups on the old backup server from the new server.

Scot