NpgsqlException无法建立与服务器的连接

I am using postgreSQL in my application, But some times it throws NpgsqlException after a fixed interval of time.

我在我的应用程序中使用postgreSQL，但有时它会在固定的时间间隔后抛出NpgsqlException。

Below is the stack trace of the exception :

下面是异常的堆栈跟踪：

Exception message: Failed to establish a connection to 'server'.
   at EntitySpaces.Interfaces.esDataProvider.esLoadDataTable(esDataRequest request, esProviderSignature sig)
   at EntitySpaces.Interfaces.esDynamicQuery.Load()
   at BusinessObjects.Users.ValidatePassword(String UserName, String Password) in e:\Code\Entities\Custom\Users.cs:line 50
   at PassiveSTS.Login.Login_Authenticate(Object sender, AuthenticateEventArgs e) in e:\Code\STS\Login.aspx.cs:line 32
   at System.Web.UI.WebControls.Login.AttemptLogin()
   at System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e)
   at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Failed to establish a connection to 'server'.
   at Npgsql.NpgsqlClosedState.Open(NpgsqlConnector context) in C:\Npgsql\NpgsqlClosedState.cs:line 171

Please help if anyone Knows, What i am doing wrong.

如果有人知道，请帮忙，我做错了什么。

Thanks in Advance.

提前致谢。

1 个解决方案

#1

Go to following folder, Program Files\PostgreSQL\9.4\data

转到以下文件夹，Program Files \ PostgreSQL \ 9.4 \ data

open the file 'pg_hba.conf' and addline in following section,

在下一节中打开文件'pg_hba.conf'和addline，

IPv4 local connections: host all all 100.10.1.00/24 md5

IPv4本地连接：主机全部为100.10.1.00/24 md5

where 100.10.1.00 is the server ip from which you are accessing postgres server.

其中100.10.1.00是您从中访问postgres服务器的服务器IP。

Otherwise you can Add following line,

否则你可以添加以下行，

host all all 0.0.0.0/0 md5

主持所有0.0.0.0/0 md5

that allow all ips to connect. Restart server and try.

允许所有ips连接。重启服务器并尝试。

Add following lines to 'postgresql.conf' file

将以下行添加到'postgresql.conf'文件中

listen_address = '*' port = 5432

listen_address ='*'port = 5432

#1