Thursday, 22 September 2011

SQL @@SERVERNAME can return NULL, but it should not

Probably we are all using "@@SERVERNAME" variable for geting SQL Server name and usually it does what we expect.

Today some custom maintenance procedures stoped working. After investigation I've noticed that SELECT @@SERVERNAME returns "NULL".

Background: @@SERVERNAME gets value (at SQL Server boot) from table sys.servers where server_id is equal to 0.

SELECT [name] FROM sys.servers WHERE server_id = 0

in this system table there are also linked servers and "my server" was there with server_id different than zero.

EXEC master.dbo.sp_dropserver @server=N'serverName', @droplogins='droplogins'
EXEC sp_addserver 'serverName', LOCAL

and restart server.

Good workaround (probably best practice) is to use function ServerProperty('serverName').

More info at:

PS Server is SQL Server 2005 Standard

Sunday, 18 September 2011

ASP.NET: Request for the permission of type 'System.Security.Permissions.FileIOPermission

Pri selitvi stare 2.0 aplikacije, k novemu gostitelju se mi je pojavila naslednja napaka:

Napaka (ob zagonu aplikacije):
Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
at System.Security.CodeAccessPermission.Demand()
at System.IO.Directory.GetCurrentDirectory()
at System.Security.Cryptography.Xml.Reference.CalculateHashValue(XmlDocument document, CanonicalXmlNodeList refList)
at System.Security.Cryptography.Xml.SignedXml.BuildDigestedReferences()
at System.Security.Cryptography.Xml.SignedXml.ComputeSignature()
at xPortTools.xPortTools3.GenerateLicense(String lcHash, String ProductId, String lcToken, String lcKey, String lcHeader, String lcSupport, String lcWeb, String lcManufacturer, String lcManufacturerEmail, String lcCopyright, String lcDescription, Boolean Demo, DateTime ldActivationDate, String CdKey)
Namesto "System.Web.Configuration.WebConfigurationManager" uporabi "System.Configuration.ConfigurationManager". Strežnik je nastavljen na "medium trust" in preprečuje uporaba "WebConfigurationManger".