FATAL: 28000: no pg_hba.conf entry for host "fe80::1970:8120:695:a41e%12"

IPv6가 활성화된 클라이언트에서 PostgreSQL 서버를 접속했더니 다음과 같은 오류가 발생합니다.

Server Error in '/' Application.

FATAL: 28000: no pg_hba.conf entry for host "fe80::1970:8120:695:a41e%12", user "testuser", database "testdb", SSL off 
  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: Npgsql.NpgsqlException: FATAL: 28000: no pg_hba.conf entry for host "fe80::1970:8120:695:a41e%12", user "testuser", database "testdb", SSL off

Source Error: 

Line 54:             {
Line 55:                 connection.ConnectionString = oledbConnectionString;
Line 56:                 connection.Open();
Line 57: 
Line 58:                 NpgsqlCommand command = new NpgsqlCommand();

 Source File:  D:\...\WebSiteTest\postgreSQLTest.aspx.cs    Line:  56 

Stack Trace: 

[NpgsqlException (0x80004005): FATAL: 28000: no pg_hba.conf entry for host "fe80::1970:8120:695:a41e%12", user "testuser", database "testdb", SSL off]
   Npgsql.<ProcessBackendResponses_Ver_3>d__a.MoveNext() in C:\projects\Npgsql2\src\Npgsql\NpgsqlState.cs:686
   Npgsql.NpgsqlState.IterateThroughAllResponses(IEnumerable`1 ienum) in C:\projects\Npgsql2\src\Npgsql\NpgsqlState.cs:319
   Npgsql.NpgsqlConnectedState.Startup(NpgsqlConnector context) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnectedState.cs:52
   Npgsql.NpgsqlConnector.Open() in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnector.cs:656
   Npgsql.NpgsqlConnectorPool.GetPooledConnector(NpgsqlConnection Connection) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnectorPool.cs:423
   Npgsql.NpgsqlConnectorPool.RequestPooledConnectorInternal(NpgsqlConnection Connection) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnectorPool.cs:226
   Npgsql.NpgsqlConnectorPool.RequestPooledConnector(NpgsqlConnection Connection) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnectorPool.cs:174
   Npgsql.NpgsqlConnectorPool.RequestConnector(NpgsqlConnection Connection) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnectorPool.cs:158
   Npgsql.NpgsqlConnection.Open() in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnection.cs:536
   WebSiteTest.postgreSQLTest.Page_Load(Object sender, EventArgs e) in D:\...\WebSiteTest\postgreSQLTest.aspx.cs:56
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2952}

닷넷에서 접근해보는 PostgreSQL DB
; https://www.sysnet.pe.kr/2/0/961

PostgreSQL pg_hba.conf Issue
; http://stackoverflow.com/questions/6643050/postgresql-pg-hba-conf-issue

host      all        all       fe80::1970:8120:695:a41e/128       md5

IPv4/IPv6 subnet calculator
; http://www.gestioip.net/cgi-bin/subnet_calculator.cgi