[Samba] Must restart Samba regularly because saving files stops working

[Roel Slegers]

One of our sites is currently testing Samba 3.0.21c as PDC on HP-UX
11.00 with openldap backend.
>From time to time - about every two days - it suddenly becomes
impossible for the clients (NT4 & XP) to save any more files to the
samba shares. When the problems start occurring they simply stop and
restart samba, and then everything works again for a couple of days.
Please not that the samba processes were NOT crashed; they were still
running.

Odd thing is that creating stupid little files from a Windows command
prompt - e.g. "echo SomeText > SomeFileOnASambaShare" - does continue
to work, but saving files (even small ones) in for instance MS Word
does not work.

There are no disk space problems.
I saw no problems in syslog.

The HP-UX server does seem somewhat low on system RAM. COULD THIS
EXPLAIN SUCH PROBLEMS?
OTHER IDEAS?

Below are some extracts from log.smbd (debug level 2). I cleaned out
all irrelevant messages, and left only the "real" error messages. I
SUSPECT that the problems occur at about the same time as "the
_net_sam_logon: creds_server_step failed. Rejecting auth request "
messages, but for now I'm not sure about that at all.

---------------------------- extracts from log.smbd
----------------------------
[2006/07/17 07:35:39, 2] smbd/sesssetup.c:(772)
  setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all old
resources.
  guest user (from session setup) not permitted to access this share (programs)
  open_sockets_smbd: accept: No buffer space available

[2006/07/17 08:34:05, 2] libsmb/credentials.c:(159)
  creds_server_check: credentials check failed.
[2006/07/17 08:34:05, 2] rpc_server/srv_netlog_nt.c:(665)
  _net_sam_logon: creds_server_step failed. Rejecting auth request
from client VOEREN12 machine account VOEREN12$

[2006/07/17 08:37:11, 2] auth/auth.c:(315)
  check_ntlm_password:  Authentication for user [administrator] -> [administrato
r] FAILED with error NT_STATUS_NO_SUCH_USER
[2006/07/17 08:37:21, 2] auth/auth.c:(315)
  check_ntlm_password:  Authentication for user [administrator] -> [administrato
r] FAILED with error NT_STATUS_NO_SUCH_USER
  open_sockets_smbd: accept: No buffer space available

[2006/07/17 08:37:38, 2] rpc_server/srv_samr_nt.c:(2670)
  Returning domain sid for domain VOEREN_DOM -> S-1-5-21-406224505-1568694035-11
63074499
  guest user (from session setup) not permitted to access this share (programs)

[2006/07/17 08:48:50, 0] lib/util_sock.c:(528)
  read_data: read failure for 4 bytes to client 14.42.47.113. Error = Connection
 timed out

[2006/07/17 09:22:49, 0] lib/util_sock.c:(528)
  read_data: read failure for 4 bytes to client 14.42.47.112. Error = Connection
 timed out
[2006/07/17 09:22:50, 0] lib/util_sock.c:(528)
  read_data: read failure for 4 bytes to client 14.42.47.112. Error = Connection
 timed out
[2006/07/17 09:22:56, 0] lib/util_sock.c:(528)
  read_data: read failure for 4 bytes to client 14.42.47.112. Error = Connection
 timed out

[2006/07/17 09:56:37, 2] rpc_server/srv_samr_nt.c:(2670)
  Returning domain sid for domain VOEREN_DOM -> S-1-5-21-406224505-1568694035-11
63074499
--------------------------------------------------------