web.config配置问题!大虾帮我

我的web.config  如下:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="ConnectionString" value="server=localhost;database=UDS;User Id=sa;pwd=;"/>
<!-- <add key="ConnectionString" value="server=xm2003;database=uds_dongzhou_net2.0;User Id=sa;pwd=;"/>-->
<add key="IndexConnectionString" value="Provider=MSIDXS; Data Source=UDS;"/>
</appSettings>
<system.web>
<compilation defaultLanguage="c#" debug="true">
<!-- <assemblies><add assembly="CrystalDecisions.CrystalReports.Engine, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.ReportSource, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Shared, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Web, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></assemblies>--><assemblies><add assembly="CrystalDecisions.CrystalReports.Engine, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.ReportSource, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Shared, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Web, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></assemblies></compilation>
<customErrors defaultRedirect="Error.aspx" mode="Off"/>
<authentication mode="Forms">
<forms name="UDSAuth" loginUrl="SubModule/Login/index.aspx" protection="None" timeout="216000" path="/"/>
</authentication>
<globalization requestEncoding="gb2312" responseEncoding="gb2312" fileEncoding="gb2312" culture="zh-cn"/>
<httpRuntime maxRequestLength="102400" useFullyQualifiedRedirectUrl="true" executionTimeout="300"/>
</system.web>
<!-- set secure paths -->
<location path="Inc">
<system.web>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
</location>
<location path="SubModule">
<system.web>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
</location>
</configuration>错误如下:Server Error in '/UDS' Application.
--------------------------------------------------------------------------------Login failed for user 'sa'. Reason: Not associated with a trusted SQL Server connection. 
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: Login failed for user 'sa'. Reason: Not associated with a trusted SQL Server connection.Source Error: 
Line 101: }
Line 102: if(con.State ==System.Data.ConnectionState.Closed)
Line 103: con.Open();
Line 104:
Line 105: }
 Source File: C:\Inetpub\wwwroot\UDS\Components\Database.cs    Line: 103 ==============================================================================
我的sa 人密码为空,在装sql时,我用的是混合登陆.如何解决!!!!!
有别的方法来解决吗!