Portal JCo's using SNC

I have configured a Jco in my SLD, configured a system in the portal and the connection test to the backend is successful.
I then changed the System properties in the portal to SNC and the connection still worked.
I then changed the JCo in the SLD but the Pint and Test from the SLD using the SNC Jco now does not work. The following errors occur
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: connection closed without message (CM_NO_DATA_RECEIVED)
Failed to ping JCo destination 'SAP_R3_HumanResources'
Any clues

Hi Graham,
Please have a look at [JCo Exceptions |http://help.sap.com/saphelp_nw70ehp1/helpdata/en/f6/daea401675752ae10000000a155106/content.htm]
Hope it will helps
Regards
Arun

Similar Messages

Configure SSO for ITS to R/3 using SNC/Kerberos

Our R/3 systems had been configured for SSO using SNC and Kerberos for awhile now. We now have a requirement to configure SSO between ITS and R/3. Since our R/3 env. has been using kerberos library, we won't be able to use SAP Cryptographic library. I had modified the registry, environment and services in itsadmin to point to the kerberos library and principal names for agate and r/3 servers as described in SNC User Guide; also, I updated table SNCSYSACL with the Agate SNC name. That seems to work fine. From the trace file, it recognized GSS-API library for Kerberos and the SNC name for Agate. However, when I tried to logon to R/3 from ITS, I still am being prompted with the logon screen to enter my SAP account/password.
I found several whitepapers and documentations stating that ITS does support Kerberos for SSO but I couldn't find any procedure on how to implement it. Following is the error I'm getting from the sapbasis.trc file but I can't find any document on this error:
=====================================================
[Thr 5284] SncInit(): Initializing Secure Network Communication (SNC)
[Thr 5284]       PC with Windows NT (mt,ascii,SAP_UC/size_t/void* = 8/32/32)
[Thr 5284] SncInit(): Trying environment variable SNC_LIB as a
      gssapi library name: "C:\WINNT\system32\gsskrb5.dll".
[Thr 5284]   File "C:\WINNT\system32\gsskrb5.dll" dynamically loaded as GSS-API v2 library.
[Thr 5284]   The internal Adapter for the loaded GSS-API mechanism identifies as:
Internal SNC-Adapter (Rev 1.0) to Kerberos 5/GSS-API v2
[Thr 2888] Sun Jan 15 22:44:59 2006
[Thr 2888] <<- ERROR: SncSetParam()==SNCERR_PARAM_DENIED
[Thr 2888] *** WARNING => NO Domain! domain==NULL means: No domain at all within the cookie. [sapss1_loctr 333]
[Thr 2888] Sun Jan 15 22:45:29 2006
[Thr 2888] *** WARNING => NO Domain! domain==NULL means: No domain at all within the cookie. [sapss1_loctr 333]
=====================================================
Does anyone know what am I missing? Any help is greatly appreciated.
Thank you!
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Hi Markus,
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I'm quite sure the LDAP host and port data is correct since we've been using the same information for the SAP LDAP connector and we've been using our LDAP connector between MS AD and R/3 for a long time without any problem.
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Trace:
=====================================================
2006-01-18T01:39:30.734 p001688 t4992 s0158B4E8 [sapextauth, 437]: W sapextauth: PAS session begins...
2006-01-18T01:39:30.734 p001688 t4992 s0158B4E8 [sapextauth, 456]:     sapextauth: SncNameR3 is:    "p:na1adm/[email protected]"
2006-01-18T01:39:30.734 p001688 t4992 s0158B4E8 [sapextauth, 462]:     sapextauth: SncNameAGate is: "p:[email protected]"
2006-01-18T01:39:30.750 p001688 t4992 s0158B4E8 [sapextauth, 468]:     sapextauth: SNC_LIB is:      "C:\WINNT\system32\gsskrb5.dll"
2006-01-18T01:39:30.750 p001688 t4992 s0158B4E8 [sapextauth, 568]:     sapextauth: XGatConnectSession leaving....
2006-01-18T01:39:30.750 p001688 t4992 s0158B4E8 [sapextauth, 616]:     sapextauth: XGatHandleLogin called....
2006-01-18T01:39:30.750 p001688 t4992 s0158B4E8 [sapextauth, 976]:     sapextauth: Entering XGatHandleLogin with LDAP...
2006-01-18T01:39:30.750 p001688 t4992 s0158B4E8 [sapextauth, 993]: W Either ~login or ~password missing, returning XGDKRCloginrequired.
2006-01-18T01:39:50.281 p001688 t4992 s00000000 [sapextauth, 398]:     sapextauth: XGatEventOpenSession called...
2006-01-18T01:39:50.281 p001688 t4992 s0158B4E8 [sapextauth, 616]:     sapextauth: XGatHandleLogin called....
2006-01-18T01:39:50.281 p001688 t4992 s0158B4E8 [sapextauth, 976]:     sapextauth: Entering XGatHandleLogin with LDAP...
2006-01-18T01:39:50.296 p001688 t4992 s0158B4E8 [sapextauth, 1059]:     sapextauth: LDAP port ist 389
2006-01-18T01:39:50.296 p001688 t4992 s0158B4E8 [sapextauth, 1261]: E sapextauth: LDAP authentication failed.
2006-01-18T01:39:50.296 p001688 t4992 s0158B4E8 [sapextauth, 1277]: E sapextauth: Wrong try for user Tran_Diem
2006-01-18T01:39:59.140 p001688 t4992 s00000000 [sapextauth, 398]:     sapextauth: XGatEventOpenSession called...
2006-01-18T01:39:59.156 p001688 t4992 s0158B4E8 [sapextauth, 616]:     sapextauth: XGatHandleLogin called....
2006-01-18T01:39:59.156 p001688 t4992 s0158B4E8 [sapextauth, 976]:     sapextauth: Entering XGatHandleLogin with LDAP...
2006-01-18T01:39:59.156 p001688 t4992 s0158B4E8 [sapextauth, 1059]:     sapextauth: LDAP port ist 389
2006-01-18T01:39:59.156 p001688 t4992 s0158B4E8 [sapextauth, 1261]: E sapextauth: LDAP authentication failed.
2006-01-18T01:39:59.156 p001688 t4992 s0158B4E8 [sapextauth, 1277]: E sapextauth: Wrong try for user Tran_Diem
=======================================================

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Here is the workflow that I am trying to handle:
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I don't know the expiration, you'd have to test but if users login with SAP then a token is cached for a pretty long time (even after system reboots) They do eventually expire in some cases and you run into issues if users change their passwords in SAP. You can use SNC to work around those issues if they are even issues. So if your users change their passwords often and you see the logon token expiring then use SNC server trust (KB 1500150 will have all the info you need) else try without.
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Hello,
Does anybody know if and how much performance impact there is if we use SNC for communication between the SAP Server and SAPGUI?
I think there are two areas that may be impacted; Network and server CPU.
For network load, I did find a part in "Front-End Network Requirements for SAP Business Solutions" document saying "overhead of roughly 350 bytes per user interaction step" but it does not specify the type of encryption. I wonder if there is any other info on this?
For CPU impact, how much overhead should I consider for sapgui access?
I see no field for this in the quicksizer and I can't seem to find any white papers on this subject.
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>
Peter Adams wrote:
> Ken,
>
> if you plan to use SAPcryptlib for SNC between SAP servers, then you should use a SAPcryptolib-compatible solution for the SNC communication between SAPGUI and SAP server, and there is only one vendor who can provide this. Let me know, if you need help finding it. My contact information is in my SDN business card.
Just so Kan is clear - It is not legal to use the SAP cryptolib provided by SAP for SNC between SAP GUI and SAP servers, so if x.509 is the desired mechanism you need to purchase additional software from the company which Peter works for to provide SAP GUI SNC-based SSO. I think instead, Kan might be using the free SAP supplied SNC Kerberos library, which is why I asked him to confirm this in my last post. I doubt he is interested to buy any third party software.
> As to the performance discussion: first of all, yes, there will be a small performance impact if SNC is used (no matter which type or implementation), but from our experience with many actual SNC implementations, I can state that this is practically not relevant. It is not noticeable by users. There were never any performance discussions with customers. See also SAP Note 1043694.
I agree with this - the performance impact is not noticed by users, but the system managers who look after the servers where SAP is installed, and the team responsible for the network need to be aware of any differences (if any) when SNC is turned on and when SNC is turned off. I think this is why Kan is asking these questions, not because he is concerned about users noticing any difference when they logon to SAP.
> Just a first quick comment on certain statements above: Tim's arguments for proving his overall statement are not conclusive from my perspective. Nor do I think his overall statement itself is correct.
The facts I mentioned are well known facts, e.g. symmetric crypto is far better from performance point of view than asymmetric. I know the examples I have shown which I found when doing a quick google search were not conclusive, but they were shown as initial examples, not necessarily the best examples. This is why I specifically mentioned that if you search in google yourself you will see many more references where comparisons are done between Kerberos (e.g. symmatric) compared with PKI (e.g. asymmetric).
> First of all, he only selects one aspect of performance - CPU impact of encryption algorithms.
No, I didn't. Some of the examples I referred to also discuss other differences. I also mentioend other differences such as memory and what protection level is used when configuring SNC.
> But for a true comparison, you'd have to look at all relevant aspects (latency, network overhead, ...).
Yes, I agree. No doubts here.
>Network performance overhead is usuallly worse with Kerberos than with PKI.
This is not true. When SAP is using SNC, the GSS-API standard is used and so the only network communication involves SAP software sending a standard GSS token from the workstation to the SAP server, and this GSS token is often about the same size, regardless of which mechanism is used, so any network performance differences are not related to the mechanism, but more related to the complexity of the cryptography used on each end (mostly on the server side).
>Second, you need to look at the specific usage scenario. For example, the first report referenced by Tim is an analysis about different Token Profile mechanism for WS Security, for one specific implementation. This does not allow to draw any conclusion for the SNC use case in general, and for sure not for a specific implemenation. It does not take the overhead for the encryption of the message content into account. Third, Tim associates PKI exclusively with asymmetric encryption. Yes, it is well known that asymmetric algorithms are slower than symmetric ones, but it is also well known that the encryption of the message content (by far the majority of the data) happens with symmetric encryption algorithms in the PKI scenario. With PKI-based SNC, you can even select a symmetric algorithm and use a more performant one that the ones that Kerberos prescribes.
Kerberos works with many different symmetric algorithms as well, so mentioning that the alg is selectable is not relavent to any comparison.
> To summarize, I will try and collect facts that will support the opposite point of view. From our practical experience, the performance overhead is not relevant, and criteria like consistency with SAPcryptolib, strength of security, ease of administration, choice of authentication and encryption mechanism, etc. are much more important.
>
> Peter

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