Connection to WLan failed (WPA (2) Password)

Good evening
We have got a MacBook Air since July and have been able to connect it to our privat WLan (running since years, connects 2 Iphones, 2 iPads, several Windows 7 machines and smartphones without a problem). Since this week I can't connect it to our WLan. The WPA (2) password has capital characters, small characters and numbers.
- Is it still a problem to connect a MacBook to a WLan with WPA(2) password with capital characters? (found in different foren as solution for this problem some years ago)
- Was there an update of the software that causes now problems?
Where can I find the operation system version? It is our first MacBook...
Thanks a lot
Matthias

IOS 5.1.1 should not have affected your WiFi connection, however, if you are now having problems try:
Try Settings -> General -> Reset -> Reset network settings

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M Info for wp 0
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M    pid = 212
M    severity = 0
M    status = 0
M    stat = WP_RUN
M    waiting_for = NO_WAITING
M    reqtype = DP_RQ_DIAWP
M    act_reqtype = NO_REQTYPE
M    rq_info = 0
M    tid = -1
M    mode = 255
M    len = -1
M    rq_id = 65535
M    rq_source =
M    last_tid = 0
M    last_mode = 0
M    semaphore = 0
M    act_cs_count = 0
M    csTrack = 0
M    csTrackRwExcl = 0
M    csTrackRwShrd = 0
M    mode_cleaned_counter = 0
M    control_flag = 0
M    int_checked_resource(RFC) = 0
M    ext_checked_resource(RFC) = 0
M    int_checked_resource(HTTP) = 0
M    ext_checked_resource(HTTP) = 0
M    report = >                                        <
M    action = 0
M    tab_name = >                              <
M    attachedVm = no VM
M
M *****************************************************************************
M *
M * LOCATION    SAP-Server sirillium1_SED_00 on host sirillium1 (wp 0)
M * ERROR       ThInit: db_connect
M *
M * TIME        Mon May 16 23:57:33 2011
M * RELEASE     701
M * COMPONENT   Taskhandler
M * VERSION     1
M * RC          13
M * MODULE      thxxhead.c
M * LINE        10783
M * COUNTER     1
M *
M *****************************************************************************
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M PfStatDisconnect: disconnect statistics
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XUSER Entry 1
Key         :DEFAULT
Username    :SAPSID
UsernameUCS2:S.A.P.S.E.D. . . . . . . . . . . . . . . . . . . . . . . . . . .
Password    :?????????
PasswordUCS2:?????????
Dbname      :SID
Nodename    :server1
Sqlmode     :SAPR3
Cachelimit :-1
Timeout
Isolation
Charset     :<unspecified>
XUSER Entry 2
Key         :c
Username    :CONTROL
UsernameUCS2:C.O.N.T.R.O.L. . . . . . . . . . . . . . . . . . . . . . . . . .
Password    :?????????
PasswordUCS2:?????????
Dbname      :SID
Nodename    :server1
Sqlmode     :INTERNAL
Cachelimit :-1
Timeout     :-1
Isolation   :-1
Charset     :<unspecified>
XUSER Entry 3
Key         :c_J2EE
Username    :CONTROL
UsernameUCS2:C.O.N.T.R.O.L. . . . . . . . . . . . . . . . . . . . . . . . . .
Password    :?????????
PasswordUCS2:?????????
Dbname      :SID
Nodename    :server1
Sqlmode     :SAPR3
Cachelimit :-1
Timeout
Isolation
Charset     :<unspecified>
XUSER Entry 4
Key         :w
Username    :SUPERDBA
UsernameUCS2:S.U.P.E.R.D.B.A. . . . . . . . . . . . . . . . . . . . . . . . .
Password    :?????????
PasswordUCS2:?????????
Dbname      :SID
Nodename    :server1
Sqlmode     :INTERNAL
Cachelimit :-1
Timeout     :-1
Isolation   :-1
Charset     :<unspecified>
Any idea? we are out of ideas at this moment.
Regards
Edited by: Gustavo Goicochea on May 17, 2011 6:37 PM

Natalia, this system was not resored nor copied, it was up and running before kernel update. We did some of the tests you said and someothers, here are some outputs.
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M
Users seem to be ok
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OK
END
'CONTROL';'ADMIN'
'SUPERDBA';'SYSDBA'
'SAPSID';'DBA'
'SAPR3';'DBA'
User SAPR3 does not have anything on database
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ERR
-24988,ERR_SQL: SQL error
100,Row not found
Any idea?
regards

Connection to WLan failed (WPA (2) Password)

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