SAP related errors: "[1196002] Login with user account RFC

SAP related errors: "[1196002] Login with user account RFC_SIAM failed" (196046)

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Title

SAP related errors: "[1196002] Login with user account RFC_SIAM failed"
Description

After converting your SAP system to Unicode, on login you see the following messages:

[1196003] Process task Check Namespace is UP failed.

[1196002] Login with user account RFC_SIAM failed.

[System.Exception] Access to /VIAENET/ denied.

at StdioProcessor.StdioProcessor._Execute(Job job)
at VI.JobService.JobComponents.SAPComponent.Activate(String task)
---- Start of Inner Exception ----
at VI.JobService.JobComponents.SAPComponent.Activate(String task)
at VI.JobService.JobComponents.SAPComponent._CHECK_NAMESPACE()
at VI.JobService.JobComponents.SAPComponent._InitSAPProvider()
---- Start of Inner Exception ----
at VI.JobService.JobComponents.SAPComponent._InitSAPProvider()
at VI.JobService.NSProvider.SAPProvider.Login(String SystemNumberCurr, String Host, String MandantCurr, String Language, String Account, String Password)
at VI.JobService.NSProvider.SAPProvider.Login(String Account, String Password)
at VI.JobService.NSProvider.VISAPAPI.Login()

But if you look into the trace of the SAP system, you see that the login succeeded and there are no permission problems.
Cause

The string parts of transports are converted to Unicode, but the flag identifying the module as “non-unicode” is not changed. This results in a program abortion.
Resolution

Load the Unicode transports.