PostgreSQL 9.3 PITR from remote server failing

Hello,

I used WAL continuous Archiving to a remote backup server using the
following command:

archive_command ='scp %p pgu(at)backup_server:/bkp/wal/%f && ssh
pgu(at)backup_server "gzip /bkp/wal/%f"'

The wal is getting archived fine but the recovery fails when trying to
restore using the following command:

restore_command ='ssh pgu(at)backup_server "gunzip /bkp/wal%f" && scp
pgu(at)backup_server:/bkp/wal/%f %p'

The log file shows:

< 2014-01-02 10:36:07.375 EST >LOG: database system was interrupted; last
known up at 2013-12-31 13:09:55 EST
< 2014-01-02 10:36:07.377 EST >LOG: creating missing WAL directory
"pg_xlog/archive_status"
< 2014-01-02 10:36:07.379 EST >LOG: starting point-in-time recovery to
2013-12-31 13:15:00-05
scp: /bkp/wal/f%: No such file or directory
gzip: /bkp/wal/0000000200000000000000F7: unknown suffix -- ignored
gzip: /bkp/wal/00000002.history: unknown suffix -- ignored
< 2014-01-02 10:36:18.924 EST >LOG: invalid checkpoint record
< 2014-01-02 10:36:18.924 EST >FATAL: could not locate required checkpoint
record
< 2014-01-02 10:36:18.924 EST >HINT: If you are not restoring from a
backup, try removing the file "/var/lib/pgsql/9.3/data/backup_label".
< 2014-01-02 10:36:18.930 EST >LOG: startup process (PID 30246) exited
with exit code 1
< 2014-01-02 10:36:18.930 EST >LOG: aborting startup due to startup
process failure

Here is the content of backup_server:/bkp/wal/ after I run the
recovery. 00000002.history
was 00000002.history.gz before.

[pgu(at)backup_server ~]$ ls -l /bkp/wal/
total 18456
-rw-------. 1 pgu pgu 229 Dec 31 11:59
00000001000000000000000B.00000028.backup.gz
-rw-------. 1 pgu pgu 230 Dec 31 11:59
0000000200000000000000D4.00000028.backup.gz
-rw-------. 1 pgu pgu 16777216 Dec 31 13:10 0000000200000000000000F7
-rw-------. 1 pgu pgu 231 Dec 31 13:10
0000000200000000000000F7.00000028.backup.gz
-rw-------. 1 pgu pgu 37896 Dec 31 13:12 0000000200000000000000F8.gz
-rw-------. 1 pgu pgu 16468 Dec 31 13:16 0000000200000000000000F9.gz
-rw-------. 1 pgu pgu 2000673 Dec 31 13:20 0000000200000000000000FA.gz
-rw-------. 1 pgu pgu 37598 Dec 31 13:26 0000000200000000000000FB.gz
-rw-------. 1 pgu pgu 50 Dec 31 16:43 00000002.history

restoring from the local server works consistently using:

restore_command ='gunzip /bkp/wal/%f && cp /bkp/wal/%f %p'

Could you please help me with the appropriate restore command to recover
from a remote server?

Thank you,

Kido Kouassi