ejabberd not allows more than ~180 connections

I'm experiencing very strange behaivoir of ejabberd: mnesia gets overloaded when I'm near 180 connections so no new connections is allowed anymore.
I created the script that just takes file of usernames and passwords and connects and auth in cycle. No matter how fast it happens (I tried from 0 to 2 seconds delay) I'm getting disconnected after 178 connections (plus there are about 6 exist that are not involved into experiment).
Can anybody can give a hint what is wrong in my case? I used 0.9.1 before and was able to make about a thousand of connections finely and now I have 1.1.1 version (plus http-binding patch) and can't get up to 200! :(

At the moment of problem ejabberd.log begins to contain this:
=ERROR REPORT==== 2006-06-15 04:48:25 ===
Mnesia(ejabberd@localhost): ** WARNING ** Mnesia is overloaded: {dump_log,
time_threshold}
and sasl.log this:
=CRASH REPORT==== 15-Jun-2006::04:37:43 ===
crasher:
pid: <0.3223.1>
registered_name: []
error_info: {enfile,[{erlang,open_port,[{spawn,expat_erl},[binary]]},
{xml_stream,new,2},
{ejabberd_receiver,init,1},
{gen_server,init_it,6},
{proc_lib,init_p,5}]}
initial_call: {gen,init_it,
[gen_server,
<0.219.0>,
<0.219.0>,
ejabberd_receiver,
[#Port<0.1760623>,gen_tcp,none,infinity,<0.3222.1>],
[]]}
ancestors: [ejabberd_receiver_sup,ejabberd_sup,<0.37.0>]
messages: []
links: [<0.219.0>]
dictionary: []
trap_exit: false
status: running
heap_size: 377
stack_size: 21
reductions: 100
neighbours:

=CRASH REPORT==== 15-Jun-2006::04:37:43 ===
crasher:
pid: <0.3222.1>
registered_name: []
error_info: {{badmatch,{error,{enfile,
[{erlang,
open_port,
[{spawn,expat_erl},[binary]]},
{xml_stream,new,2},
{ejabberd_receiver,init,1},
{gen_server,init_it,6},
{proc_lib,init_p,5}]}}},
[{ejabberd_receiver,start,4},
{ejabberd_c2s,init,1},
{gen_fsm,init_it,6},
{proc_lib,init_p,5}]}
initial_call: {gen,init_it,
[gen_fsm,
<0.220.0>,
<0.220.0>,
ejabberd_c2s,
[{gen_tcp,#Port<0.1760623>},
[{access,c2s},
{shaper,c2s_shaper},
starttls,
{certfile,"/etc/ssl/certs/ejabberd.pem"}]],
[]]}
ancestors: [ejabberd_c2s_sup,ejabberd_sup,<0.37.0>]
messages: []
links: [<0.220.0>]
dictionary: []
trap_exit: false
status: running
heap_size: 377
stack_size: 21
reductions: 120
neighbours:

=CRASH REPORT==== 15-Jun-2006::04:37:43 ===
crasher:
pid: <0.2859.1>
registered_name: []
error_info: {{badmatch,{error,{{badmatch,
{error,
{enfile,
[{erlang,
open_port,
[{spawn,expat_erl},
[binary]]},
{xml_stream,new,2},
{ejabberd_receiver,init,1},
{gen_server,init_it,6},
{proc_lib,init_p,5}]}}},
[{ejabberd_receiver,start,4},
{ejabberd_c2s,init,1},
{gen_fsm,init_it,6},
{proc_lib,init_p,5}]}}},
[{ejabberd_listener,accept,3},{proc_lib,init_p,5}]}
initial_call: {ejabberd_listener,init,
[5222,
ejabberd_c2s,
[{access,c2s},
{shaper,c2s_shaper},
starttls,
{certfile,"/etc/ssl/certs/ejabberd.pem"}]]
}
ancestors: [ejabberd_listeners,ejabberd_sup,<0.37.0>]
messages: []
links: [#Port<0.1760623>,<0.228.0>,#Port<0.1755093>]
dictionary: []
trap_exit: false
status: running
heap_size: 233
stack_size: 21
reductions: 36016
neighbours:

=SUPERVISOR REPORT==== 15-Jun-2006::04:37:43 ===
Supervisor: {local,ejabberd_listeners}
Context: child_terminated
Reason: {{badmatch,{error,{{badmatch,
{error,
{enfile,
[{erlang,
open_port,
[{spawn,expat_erl},
[binary]]},
{xml_stream,new,2},
{ejabberd_receiver,init,1},
{gen_server,init_it,6},
{proc_lib,init_p,5}]}}},
[{ejabberd_receiver,start,4},
{ejabberd_c2s,init,1},
{gen_fsm,init_it,6},
{proc_lib,init_p,5}]}}},
[{ejabberd_listener,accept,3},{proc_lib,init_p,5}]}
Offender: [{pid,<0.2859.1>},
{name,5222},
{mfa,{ejabberd_listener,
start,
[5222,
ejabberd_c2s,
[{access,c2s},
{shaper,c2s_shaper},
starttls,
{certfile,"/etc/ssl/certs/ejabberd.pem"}]]}},
{restart_type,transient},
{shutdown,brutal_kill},
{child_type,worker}]

=PROGRESS REPORT==== 15-Jun-2006::04:37:43 ===
supervisor: {local,ejabberd_listeners}
started: [{pid,<0.3224.1>},
{name,5222},
{mfa,{ejabberd_listener,
start,
[5222,
ejabberd_c2s,
[{access,c2s},
{shaper,c2s_shaper},
starttls,
{certfile,"/etc/ssl/certs/ejabberd.pem"}]]}},
{restart_type,transient},
{shutdown,brutal_kill},
{child_type,worker}]