User Guest
Jul 20, 2005
Nel database "master" ho mappato, per errore, l'utente "guest" su un
utente sql "XXX" creato in SQLServer.
Questo tipo di impostazione non permette più di aver accesso con
l'utente anonimo "guest" (mappato su null) al db (con autorizzazioni
limitate al ruolo public).
Ho provato sia da EM che con le varie SP a rimuovere l'utente, a
mapparlo su un'altro utente, ... ma non sono riuscito a ripristinare
la situazione di partenza.
Mi servirebbe una idea per non dover effettuare il backup di tutti i
db, disinstallare SQLServer, reinstallare SQLServer e fare il restore
di tutti i db (soluzione possibile ma che tengo come ultima
spiaggia!!).
Grazie
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Apr 17, 2008
In SQL2K5 guest user can not be dropped from ANY databases. How ever we can use the following command to disable it.
USE <Database Name>
GO
REVOKE CONNECT FROM GUEST
GO
How to find in a DB, whether guest user is disable or not, using TSQL?
------------------------
I think, therefore I am - Rene Descartes
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Feb 7, 2008
I've used the following:
EXEC sp_MSforeachdb 'USE [?];
REVOKE CONNECT FROM GUEST;'
GO
And this is what I get:
Msg 15182, Level 16, State 1, Line 2
Cannot disable access to the guest user in master or tempdb.
Msg 15182, Level 16, State 1, Line 2
Cannot disable access to the guest user in master or tempdb.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
When I do this:
EXEC sp_MSforeachdb 'USE [?];
SELECT ''[?]'' AS DBName,* FROM sysusers;'
GO
The guest sid for all tables shows 0x00, is this the reason I get above errors?
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Jan 15, 2015
I try to attach a database mdf file to Microsoft SQL server 2014 on Amazon Elastic Computing Cloud, EC2, but fail with the following message, "User 'guest' does not have permission to run DBCC checkprimaryfile. (Microsoft SQL Server, Error: 2571)" The ID I use to REMOTE login has administrator rights and I have chosen to "run as administrator"
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Jul 17, 2007
Everytime I reboot my sql server 2000 the guest account on tempdb is gone, but the guest account on master remains.
Can anyone offer my any ideas how I can stop that from happening?
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Sep 24, 2015
I've read a bunch of articles saying you should always remove the guest user from the user databases and model. It seems to me that if a user only has public access then the user can't do anything on the database. If the guest user only has public access to a user database how is it a security threat? I must be missing something.
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Sep 18, 2006
Hi all.
I don't know if this is the right forum to post this question, but here it goes.
We have restored into sql 2005 the database backups made in sql 2000. We connect with trusted connection and application roles, and when trying to execute a transaction to another database (with the guest user), we get a permission error.
Does anyone know if, apart from restoring the databases, we should do something else to get the guest user working the same way as with sql 2000 in the restored databases?
Thanks in advance for your help.
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Apr 17, 2015
Below query tells us if guest user is enabled or disabled in a particular database
SELECT dp.name, CASE perms.class WHEN 0 THEN 'Yes' ELSE 'No' END AS 'Enabled'
FROM sys.database_principals dp
LEFT JOIN (SELECT grantee_principal_id, class FROM sys.database_permissions
WHERE class = 0 AND type = 'CO' AND state = 'G') AS perms
ON dp.principal_id = perms.grantee_principal_id
WHERE dp.name = 'guest';
Do we have a query which can also add the database name to above query output? The output must have columns with data against Name,Enabled,Database name
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May 16, 2007
Sir i am trying to connect sql from my LAN to my networked computers but whenever i tried to register it through Enterprise manager i get following "SQL Server registration failed because of the conection failure displayed below.Do you wish to Register anyway? Login failed for user 'SW17/Guest'
where SW17/ is my another computer name...
i have checked tcp and named pipes
and confirm username for sql authentication too
please help me as i being late submit my project
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Oct 25, 1999
If our SQL Server is not part of a domain, can "Guest" users still connect to the SQL server?
What we are experiencing is -- when a drive is mapped to the server connectivity is fine.
But, without the drive mapping, the SQL connections cannot be made.
Thoughts, Ideas,
(hopefully without adding unique logins for each user at the server)
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Dec 13, 2004
I want to know what is the guest account and what its use for ?
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Apr 21, 2006
Hello world
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May 11, 2004
I would like a guest to view some items on the application.
And I recently intalled SQL Server 2000 on my machine. Will integrate Access when ready.
I can access or simply read data from a db if I specify User ID and Password.
Such as....
Dim nwindConn As SqlConnection = New SqlConnection("Data Source=localhost;User Id=sa;Password=xxxxx;Initial Catalog=Northwind;")
Yes, testing first, then adjusting all my code for the SQL instead of Access.
If I leave the id and pw out, it won't read - login failure.
I have read so much on authentication and some posts here, even the one on login failure, but that didn't help.
Keep in mind, just installed, only users are the default ones by the installation.
What setting in the SQL Server is there, and I have looked, that if it's a guest, no id or pw, allow read only to items such as datagrids which only read from tables?
Thanks all,
Zath
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Jan 17, 2001
How do you disable Guest account in SQL Server.
can you do this thru registry?
Tahnk You,
Piyush Patel
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Feb 28, 2001
Hi All,
I encountered a bizzard situation. The guest id in tempdb disappeared after I rebooted (shutdown and startup) my server. That caused errors in application whenever a stored proc needs to create a temporary table.
Has anyone seen this happened before? Any idea on why or how it happened?
Thanks in advance.
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Oct 18, 2005
Hi,
I know this seems odd but is there any way to change the guest's password?
I know this is paradoxical regarding the nature of guest user but if there is any way please clarify me!
-Thanks
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Apr 15, 2008
Hi,
I have some questions regarding guest acct. I am using some database security scanning software (again) and it says that guest acct should be dropped from these databases, msdb, pubs, Northwind.
Can i safely say that i can drop the guest acct in pubs and Northwind without any issue?
For msdb, will there be any concerns? How can i verify?
If i just revoke the public permission on guest, is it the same as dropping the user?
Lastly, I see that in all databases, the guest acct exists, but some are of permit and some are of via group membership for the database access column. What is the difference?
Thanks guys. appreciate your help. Audit deadline coming up.. i still have about 20 more audit pts to go... :)
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Nov 18, 2006
Just wondering what is the use of the build in guest account in SQL2000?
Should you remove it? Or just leave it there?
I quess a user can make an odbc connection to the database with that account, but can cause no harm.
What to do?
Greetz,
The nerd.
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Apr 23, 2006
When i restart my database server, guest login is getting deleted automatically from tempdb. it shudn't happen. please can anyone suggest me solution for my problem.
thanx and regards
kiran
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Jan 7, 2008
Hi All:
I hope I'm in the correct forum for this question. If I'm not, forgive me and point me in the proper direction.
I have SQL Server 2000 databases that I am trying to secure. To that end I've deleted the guest account from all but the master and tempdb databases.
Within the master db I've denied access of any "flavor" to all objects but spt_values, syscharsets, sp_MSSQLDMO80_version, and sp_MSdbuserpriv (only because I've discovered they are necessary).
Can anyone tell me where I might find the absolute minimum permissions configuration for the guest account in master?
I have no third party vendor software accessing my SQL Server 2000 databases. The thought of
Demographics:
SQL Server 2000 sp4 running on Windows 2003 Server with the current service packs.
Any help is greatly appreciated.
caeriel
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Jul 23, 2005
Can I use osql to known the database install on a server via 'guest'account ?I had over 300 servers with sql server all around France (differentversion : 6.5, 7 and 8)I need to check all database on each servers from my place.Of course, also it would have been to easy, I don't have all 'sa'password...Is that possible to use the 'guest' account to execute a query likethis via osql :Extract.sqlexec sp_helpdbExtract.cmdfor /f "usebackq tokens=1 delims=" %%i IN (ListServer.txt) DOosql-S%%i -Uguest -P -dmaster -i"C:ExtractionExtract.sql"-o"C:Extraction\%%i.rpt"Could I query 'master' with the 'guest' account ?Or any other ideas how to do this by an other way ?Thanks
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May 14, 2008
Hi Guys,
We are using MS SQL 2005. I am ask to remove the PUBLIC rights to the objects listed in the following query in the master DB:
SELECT sysusers.name, sysobjects.name,sysprotects.action FROM sysobjects, sysusers, sysprotects WHERE sysobjects.id = sysprotects.id AND sysprotects.uid = sysusers.uid AND sysprotects.protecttype = 205
I keep having the "Cannot find the object [Objectname], because it does not exists or you do not have permission."
How do I create a query to remove the PUBLIC rights at a single run. (There are total of 1660 items, please dun ask me to write the DENY or REVOKE statement 1660 time )
How do I DENY the rights for objects starting with the prefix "dm_" or items like "TABLE PRIVILEGES"
Thanks guys Any help on this is greatly appreciated.
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Jul 30, 2007
Hi
I have a situation (on SQL Server 2000 SP3a) where the guest account appears in the list of database users despite the account being removed via sp_dropuser.
The guest account appears in the list of users with Database Access set as 'Via Group Membership'
Once in this state it cannot be removed as sp_drop user will now report:
Server: Msg 15008, Level 16, State 1, Procedure sp_revokedbaccess, Line 36
User 'guest' does not exist in the current database.
My conerns are:
(a) Does this imply any security risks ?
(b) How can I remove all reference to the guest account?
Any ideas or suggestions would be appreciated
Regards
Nadreck
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Sep 8, 2006
Hi all,
I have setup a new SQL 2000 SP4 and internal auditor query about revoke permission from Public role and remove guest from all databases.
1. Can I revoke all default permissions (select on system tables in all DBs) from "Public" role? I am concern any error after such action.
2. I found that guest account in DB -- master, tempdb and msdb. According to Microsoft documents. The account should not remove and can't from master and tempdb. How about msdb?
Thanks,
Regards,
Edwin
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Mar 1, 2007
Hello (help),
In SQL2000, when the Guest account was assigned into a role, such as db_datareader, then querying across databases worked just fine.
Specifically:
I have a Report Writer application that connects to the SQL Server with a login (ReportRunner) that actually has very limited permissions on a database.
The connection is then set (sp_setapprole) to use an Application role (App_RR) that has the necessary permissions.
The report-writer app calls a Stored Procedure that gathers data from several other databases (on the same SQL instance).
In SQL 2000, accessing these other databases was done through Guest - we assigned Guest to the db_datareader role. All worked fine.
We've just upgraded to SQL2005: reports started failing. It seems that although guest is assigned to the db_datareader role, the permissions for Guest don't allow selecting from tables via the db_datareader role: we've had to GRANT SELECT TO Guest specifically on the tables necessary for the report.
Is anyone aware of a design change withing SQL Server such that the Guest principal's roles are disregarded when assessing permission? Is there a new and better way to structure the permissions?
Thanks in advance for your help.
Mark Starr
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Jul 22, 2015
One of our databases has at some point in its dark past had the owner of the guest schema changed to be a named user, rather than the default guest user. Correcting this feels like it would be easy enough by running the following...
  ALTER AUTHORIZATION ON SCHEMA::guest TO guest
but that results in..
  Msg 15150, Level 16, State 2, Line 3
  Cannot alter the schema 'guest'.
I realise the guest schema is a special one, and cannot be dropped, but I'm not trying to do that. End goal is to export the database to a SQL Azure DB, and this guest schema assignment is blocking that process from completing.
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Dec 7, 2006
This is my first time to deploy an asp.net2 web site. Everything is working fine on my local computer but when i published the web site on a remote computer i get the error "Failed to generate a user instance of SQL Server due to failure in retrieving the user's local application data path. Please make sure the user has a local user profile on the computer. The connection will be closed" (only in pages that try to access the database)
Help pleaseee
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May 22, 2008
Hi,
Please give the T-SQL script for this ? Thanks
Shanth
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Sep 28, 2007
When I am in Visual Studio 2005, and I try to add an SQL database, I get the following error "generating user instances in sql server is disabled. use sp_configure user instances enabled to generate user instances." I am currently using SQL server 2005 Express. What do I need to do, to create an SQL database? Thanks in advance.
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Nov 22, 2007
i'm using the Enterpirse library logger to write logs into a database.
When choosing connection string i choose the database i want in the "connection properties" dialog box and
push 'Test connection' button.
everything goes well.
then i open the SQL Server Management studio express and connect to the databse to check some things,
from that point on , when i push the 'Test Connection' button in the Enterprise library i get the error:
"cannot open user default database. Login failed. login failed for user My'server/MyuserName'"
even when i close the sql server manager , it is still stuck - the connection test doesn't work anymore....
it only work when i restart the computer.
why ?
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Mar 3, 2008
Cannot open user default database. Login failed.Login failed for user
'NT AUTHORITYNETWORK SERVICE'. 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.Data.SqlClient.SqlException: Cannot open user default database. Login
failed.Login failed for user 'NT AUTHORITYNETWORK SERVICE'. I have This Error When i try to log into My online web site, i have no idea how to fix it,one day it was working and the next it wasnt, is there any way to find out what database the default is and if it's either incorrect or not present change the web.config in a way that will make my system work. i have the NT Authority/Network Service in my Server Properties Permissions, its given the type login and is granted Connect SQL by sa i have 3 colder copies of the web site on my server my question is, how would i use of of these to restore the original site configuration is there a way to restore the original configuration to undo whatever it is i've done to break the system ChrisStressed
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Dec 6, 2013
I would like to know if there is a way to find out who changed a users roles/access WITHOUT using the audit function. For example, if a user account was created and given SA access then changed to read only, how can I find out who made that change? I tried searching for an answer, but kept getting no results. I'm thinking this may tie into the sys.sysusers view?
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