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I'm using proftpd and somtimes during image upload i got this error:

"503 bad sequence of commands"

What could be wrong? How to solve this problem?

EDIT

I'm using SolEx sync to synchronize database with the other program. It worked good on the other server but it throws 503 on mine.

tail -f /var/log/proftpd/proftpd.log -n100
Feb 06 13:17:08 vz10296 proftpd[7356] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:17:12 vz10296 proftpd[7356] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:17:13 vz10296 proftpd[7356] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:17:19 vz10296 proftpd[7356] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:23:09 vz10296 proftpd[7509] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:23:11 vz10296 proftpd[7509] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:23:12 vz10296 proftpd[7509] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:23:18 vz10296 proftpd[7509] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:24:23 vz10296 proftpd[7511] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:24:26 vz10296 proftpd[7511] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:24:26 vz10296 proftpd[7511] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:25:55 vz10296 proftpd[7511] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): mod_delay/0.6: unable to load DelayTable '/var/run/proftpd.delay' into memory: Bad file descriptor
Feb 06 09:25:55 vz10296 proftpd[7511] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:35:00 vz10296 proftpd[7523] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:35:01 vz10296 proftpd[7523] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels'
Feb 06 09:35:04 vz10296 proftpd[7523] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels: Login successful.
Feb 06 09:35:11 vz10296 proftpd[7523] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:35:15 vz10296 proftpd[7524] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:35:15 vz10296 proftpd[7524] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels'
Feb 06 09:35:18 vz10296 proftpd[7524] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels: Login successful.
Feb 06 09:35:18 vz10296 proftpd[7524] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:35:20 vz10296 proftpd[7525] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:35:20 vz10296 proftpd[7525] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels'
Feb 06 09:35:23 vz10296 proftpd[7525] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels: Login successful.
Feb 06 09:36:07 vz10296 proftpd[7525] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:36:09 vz10296 proftpd[7526] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:36:12 vz10296 proftpd[7526] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels'
Feb 06 09:36:14 vz10296 proftpd[7526] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels: Login successful.
Feb 06 13:40:50 vz10296 proftpd[7559] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:40:51 vz10296 proftpd[7559] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:40:52 vz10296 proftpd[7559] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:42:21 vz10296 proftpd[7559] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): mod_delay/0.6: unable to load DelayTable '/var/run/proftpd.delay' into memory: Bad file descriptor
Feb 06 09:42:22 vz10296 proftpd[7559] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:57:23 vz10296 proftpd[7580] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:57:25 vz10296 proftpd[7580] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:57:25 vz10296 proftpd[7580] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:57:26 vz10296 proftpd[7580] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:57:59 vz10296 proftpd[7581] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:58:01 vz10296 proftpd[7581] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:58:02 vz10296 proftpd[7581] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:58:03 vz10296 proftpd[7581] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:58:03 vz10296 proftpd[7582] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:58:05 vz10296 proftpd[7582] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:58:06 vz10296 proftpd[7582] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:58:07 vz10296 proftpd[7582] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 13:58:07 vz10296 proftpd[7583] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 09:58:09 vz10296 proftpd[7583] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 09:58:10 vz10296 proftpd[7583] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 09:59:37 vz10296 proftpd[7583] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 14:00:30 vz10296 proftpd[7607] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 10:00:31 vz10296 proftpd[7607] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 10:00:32 vz10296 proftpd[7607] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 10:00:34 vz10296 proftpd[7607] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
Feb 06 14:02:52 vz10296 proftpd[7614] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session opened.
Feb 06 10:02:54 vz10296 proftpd[7614] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): Preparing to chroot to directory '/home/wheels/www/sklep'
Feb 06 10:02:54 vz10296 proftpd[7614] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): USER wheels_sync: Login successful.
Feb 06 10:04:40 vz10296 proftpd[7614] localhost (aeia193.neoplus.adsl.tpnet.pl[79.186.208.193]): FTP session closed.
share|improve this question
1  
Which client are you using. What do the proftpd logs say ? –  Iain Feb 6 '13 at 10:00
    
should i look for an error on client or server side? –  Szymon Wygnański Feb 6 '13 at 11:02

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