SLD User gets locked; four unsuccessful logons every 15 minutes

I have a landscape with a PI with the SLD on it. I defined a user with the name SLDUSER and the appropriate authorizations. The PI is a Unicode system, like all systems in the landscape.
There were already some application servers (CRM, Banking Services, Composition Environment) connecting to this SLD and everything went fine.
Now I added another application server, an ERP, for FI-CAx (NW 7.02). As the business partners are distributed via XI through the PI system, the ERP needs to connect to the SLD, too.
I set it up as usual:
- sldapicust: host, port, SLDUSER, password. (What is weird is that there is no test button as in all the other systems ... maybe that depends on the installed EhPs.)
- This generated the destinations (type T = TCP/IP) SLD_UC and SLD_NUC automatically.
- I created destinations SAPSLDAPI and LCRSAPRFC manually in sm59, type T = TCP/IP, set them to Unicode, entered the same (two different) Registered Server Programs that are used in these destinations on all the other servers (CRM, PI, BaS).
- I ran rz70, entered the host and gateway, activated, executed the data collection.
SLDCHECK runs successfully on the ERP system!
The technical system for the BS1 showed up in the SLD as expected.
- I configured the clients / business systems on the SLD.
Now begins the problem. The SLDUSER is now getting locked all the time! It's definitely the ERP system causing it - when I prevent it from accessing the PI (by changing the hosts file on the operating system), the problem stops.
I activated everything critical related to logons and RFCs in sm19 and looked at the logs in sm20. This is what it looks like:
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Password check failed for user SLDUSER in client 001
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 1, Type = U)
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Password check failed for user SLDUSER in client 001
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 1, Type = U)
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Password check failed for user SLDUSER in client 001
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 1, Type = U)
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Password check failed for user SLDUSER in client 001
17.08.2011     19:40:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 1, Type = U)
17.08.2011     19:55:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Password check failed for user SLDUSER in client 001
17.08.2011     19:55:04     BNK_RFC     ilbnkpi1          SAPMSSY1     User SLDUSER Locked in Client 001 After Erroneous Password Checks
17.08.2011     19:55:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 1, Type = U)
17.08.2011     19:55:04     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 53, Type = U)
17.08.2011     19:55:05     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 53, Type = U)
17.08.2011     19:55:05     BNK_RFC     ilbnkpi1          SAPMSSY1     Logon Failed (Reason = 53, Type = U)
And it goes on like this. So what happens is this: Every 15 minutes, at :10, :25, :40, :55, there are four unsuccessful logons with SLDUSER. With the fifth logon it gets locked.
Again:
- This stops when I make the PI inaccessible to the ERP.
- SLDCHECK still works completely fine in ERP - until the SLDUSER is locked, of course; then it stops working in all connected systems. It does not result in unsuccessful logons on the PI.
- When I run rz70 on the ERP and run the data collection this also reports success and does not create unsuccessful logons on the PI.
- I have not used the SLDUSER in any other locations besides sldapicust.
So what the hell is wrong with this system?!

I have created a separate user SLDUSER_ER1 just for use in the sldapicust in the new ERP system that causes the problem. Still SLDUSER is getting locked (not SLDUSER_ER1)!
I powered down this ERP system ER1, just to make absolutely sure it is causing the problem - indeed the unsuccessful logon attempts every 15 minutes stopped right away.
As a workaround and for narrowing down the problem I have created separate users SLDUSER_CR1 etc. for each of the other systems in the landscape (CRM and so on) - indeed those do not get any unsuccessful logon attempts.
I have deleted all four SLD-related destinations in ER1 and recreated them from scratch (SLD_NUC and SLD_UC being generated when running rz70). I also used the "delete all batch jobs" button in rz70.
Still, SLDUSER is getting locked.
I checked on the PI system in C:\usr\sap\PI1\DVEBMGS00\j2ee\cluster\server0\log\system\httpaccess\responses_00.0.trc and see it is indeed the IP of the ERP system that gets the error 401 exactly at the times when the unsuccessful logon attempts occur:
[Oct 2, 2011 2:46:06 PM   ] - 10.26.83.234 : POST /sld/cimom HTTP/1.1 401 1499 [140]
[Oct 2, 2011 2:46:06 PM   ] - 10.26.83.234 : POST /sld/cimom HTTP/1.1 401 1499 [79]
[Oct 2, 2011 2:46:06 PM   ] - 10.26.83.234 : POST /sld/cimom HTTP/1.1 401 1499 [62]
[Oct 2, 2011 2:46:06 PM   ] - 10.26.83.234 : POST /sld/cimom HTTP/1.1 401 1499 [47]
As the ERP has no Java instance and the sldapicust does not contain the SLDUSER (but the new SLDUSER_ER1) it is a mystery to me what it is that is still running every 15 minutes in the ERP and tries to use SLDUSER.
I went through the entries in SECSTORE and could not find any use of SLDUSER (only of SLDUSER_ER1, as it should be).
Edited by: Monika Eggers on Oct 2, 2011 3:08 PM

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