ADI connect to database problem

hellow,
We have a strange problem:
We have some users installed an ADI on their PC's.
problem is that one pc station can connect to the database with every valid application user, while all the
other users cannot.
they get an invalid username/password for any valid application user, or cannot connect to database.
all of the users share the same database connection definition:
Currentdatabase: perp11i
Description: perp11i
GWYUID: applsyspub/pub
FNDNAM: APPS
connect string : perp
Server id: erpdb
I suspect that something there is something different in those PC (maybe the oracle_home version or so)
Does anybody have any idea on this issuse?
Thank you

yes, i ran the wizard to check the configuration.
it show some errors like :
***Problems encountered.***
***1. The following file(s) were not found :***
***o SSDATB32.OCX***
***Replace the above files in C:\WINDOWS\SYSTEM32 with the corresponding files in C:\orant\GLDI90\SUPPORT***
***using the instructions in the description above.***
but it is not that simple, because the i get those error on a PC's that CAN connect to ADI while others (where the wizrard check is perfect), are still cannot connect to ADI and get the "cannot connect to fatabase / invalid username-password" error.

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http://help.sap.com/saphelp_webas630/helpdata/en/b0/6e62f30cbe9e44977c78dbdc7a6b27/frameset.htm
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user9290950 wrote:
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From default trace:
======
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======
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======================
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=================
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Most people don't ever notice the issue because remote mail servers retry the connection later. However, telephone voice mail systems that forward voice message files to email, or other such applications such as your scanner, often don't retry and
simply fail. Our phone system actually disables all further attempts to send voice mail to a particular user if the PRX5 error is returned when the email is sent by the phone system.
Is Microsoft totally oblivious to this problem?
PRX5 is a serious issue that needs an Exchange team resolution, or at least an acknowledgement that the problem actually does exist and has negative consequences for proper mail flow.
JSB

Server Error in '/' Application. [COMException (0x81020024): Unable to connect to database]

Hi,
My team and I are trying to resolve this issue. some of our users are having trouble uploading data into the database. this is the error that they are getting.
I would really appreciate it if you could help me get ridd fo this issue.
Server Error in '/' Application.
Unable to connect to database. Check database connection information and make sure the database server is running.
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details:
System.Runtime.InteropServices.COMException: Unable to connect to database. Check database connection information and make sure the database server is running.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace
below.
Stack Trace:
[COMException (0x81020024): Unable to connect to database. Check database connection information and make sure the database server is running.]
   Microsoft.SharePoint.Library.SPRequestInternalClass.PreInitServer(String bstrAbsoluteRequestUrl, String bstrServerRelativeUrl, Int32 lZone, Guid gApplicationId, Guid gSiteId, Guid gDatabaseId,
String bstrDatabaseServer, String bstrDatabaseName, String bstrDatabaseUsername, String bstrDatabasePassword, Boolean fHostHeaderIsSiteName) +0
   Microsoft.SharePoint.Library.SPRequest.PreInitServer(String bstrAbsoluteRequestUrl, String bstrServerRelativeUrl, Int32 lZone, Guid gApplicationId, Guid gSiteId, Guid gDatabaseId, String
bstrDatabaseServer, String bstrDatabaseName, String bstrDatabaseUsername, String bstrDatabasePassword, Boolean fHostHeaderIsSiteName) +359
[SPException: Unable to connect to database. Check database connection information and make sure the database server is running.]
   Microsoft.SharePoint.Library.SPRequest.PreInitServer(String bstrAbsoluteRequestUrl, String bstrServerRelativeUrl, Int32 lZone, Guid gApplicationId, Guid gSiteId, Guid gDatabaseId, String
bstrDatabaseServer, String bstrDatabaseName, String bstrDatabaseUsername, String bstrDatabasePassword, Boolean fHostHeaderIsSiteName) +479
   Microsoft.SharePoint.SPSite.PreinitializeServer(SPRequest request) +666
   Microsoft.SharePoint.SPWeb.InitializeSPRequest() +548
   Microsoft.SharePoint.SPWeb.EnsureSPRequest() +75
   Microsoft.SharePoint.SPWeb.get_Request() +74
   Microsoft.SharePoint.WebControls.SPControl.SPWebEnsureSPControl(HttpContext context) +613
   Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(HttpContext context) +41
   Microsoft.SharePoint.SPContext.get_Current() +123
   CKS.EBE.BlogContext.get_BlogEnabledSite() +37
   CKS.EBE.BlogHttpModule._app_PostAuthorizeRequest(Object sender, EventArgs e) +113
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171
the description of the error on the server is as follows:
The description for Event ID ( 27745 ) in Source ( Windows SharePoint Services 3 ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use
the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: #50071: Unable to connect to the database MOSS_Content_RBI on BartDB\Bart. Check the database connection information
and make sure that the database server is running..

are you using the Aliases for the SQL Server, make sure your account having the correct permission.
If it is your QA farm, you can run the config wizard to fix his problem...
check this post having the similar issue.
http://social.technet.microsoft.com/Forums/sharepoint/en-US/478d6b3a-a51e-48c5-832b-5afb51c69734/unable-to-connect-to-the-sql-content-database-from-sharepoint-web-front-server?forum=sharepointadminlegacy
http://hammad1.wordpress.com/2008/06/04/unable-to-connect-to-database-in-event-logs/
Please remember to mark your question as answered &Vote helpful,if this solves/helps your problem. ****************************************************************************************** Thanks -WS MCITP(SharePoint 2010, 2013) Blog: http://wscheema.com/blog

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