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Restrict user to login from single Host

February 7, 2017 5:31 pm / Leave a Comment

Restricting user to login from single host may be sometimes required from security point and other business requirements. We can achieve it through SERVER LEVEL LOGON TRIGGER.

ALTER TRIGGER TR_CHECK_LOGIN_TEST_HOST
ON ALL SERVER
FOR LOGON
AS
BEGIN

DECLARE @HOSTNAME VARCHAR(48)
DECLARE @PROGNAME VARCHAR(100)

SELECT @HOSTNAME = HOST_NAME FROM SYS.DM_EXEC_SESSIONS
WHERE SESSION_ID = @@SPID

IF ORIGINAL_LOGIN() = ‘TEST’ AND @HOSTNAME =’HostName’
ROLLBACK;

END

Once you create above trigger, Login “TEST” will be able to connect from specified host only. Connection from any other host will be failed and face below error: –

You can also find related errors in SQL Server Error log as well.

Error: 17892, Severity: 20, State: 1.

Logon failed for login ‘TEST’ due to trigger execution. [CLIENT: <local machine>]

Error: 3609, Severity: 16, State: 2.

The transaction ended in the trigger. The batch has been aborted.

Reference: Rohit Garg (http://mssqlfun.com/)

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Write-Host || Cannot invoke this function because the current host does not implement it

February 1, 2017 9:19 am / Leave a Comment

Issue: While running powershell in SQL job step, I am getting below error: –

A job step received an error at line 13 in a PowerShell script. The corresponding line is ‘Write-Host “ServerName: ” $comp’. Correct the script and reschedule the job. The error information returned by PowerShell is: ‘Cannot invoke this function because the current host does not implement it. ‘. Process Exit Code -1. The step failed.

Solution: SQL Server Agent allows users to directly run PowerShell scripts in SQL Server Agent. Internally this is implemented by reusing the SQLPS.EXE shell. When SQL Server Agent starts SQLPS.EXE, it does not do this through the console (there is no console attached).

When you run Write-Host, PowerShell asked to write on host console but due to no availability of HOST console, we got error.

I removed Write-Host to resolve issue.

Reference: Rohit Garg (http://mssqlfun.com/)

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Error While running PowerShell code from SQL Agent job – “Path Does Not Exist”

January 23, 2017 5:12 pm / 1 Comment on Error While running PowerShell code from SQL Agent job – “Path Does Not Exist”

Issue: When I am running code from PowerShell console its running fine but when I execute it through SQL agent job step, I am getting below error: –

The job script encountered the following errors. These errors did not stop the script: A job step received an error at line 14 in a PowerShell script. The corresponding line is ‘$files = Get-ChildItem “\\$comp\D$\*.xls”‘. Correct the script and reschedule the job. The error information returned by PowerShell is: ‘An object at the specified path \\ServerName\D$ does not exist. ‘ A job step received an error at line 43 in a PowerShell script. The corresponding line is ‘ $str = Get-Content $i.FullName | Where-Object { ($_ -match ‘Alive’) }’. Correct the script and reschedule the job. The error information returned by PowerShell is: ‘Cannot bind argument to parameter ‘Path’ because it is null. ‘. Process Exit Code -1. The step failed.

Solution: SQL Server Agent allows users to directly run PowerShell scripts in SQL Server Agent. Internally this is implemented by reusing the SQLPS.EXE shell. When SQL Server Agent starts SQLPS.EXE, It cannot access file system.

To access file system, you need to change the scope from SQL to filesystem.

You can do it by adding “cd C:” before executing filesystem commands.

Reference: Rohit Garg (http://mssqlfun.com/)

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