fix sftp unregistered

.github/workflows/release.yml

@@ -58,6 +58,7 @@ jobs:
         executable_compression: upx 
         binary_name: pbs-d2d-agent
         project_path: ./cmd/pbs_windows_agent
+        ldflags: -H=windowsgui
     - uses: actions/upload-artifact@v4
       with:
         name: windows-binary

internal/agent/sftp/sftp.go

@@ -55,7 +55,7 @@ func handleConnection(conn net.Conn, sftpConfig *SFTPConfig, baseDir string) {
 		return
 	}
 
-	if strings.Contains(conn.RemoteAddr().String(), server.Hostname()) {
+	if !strings.Contains(conn.RemoteAddr().String(), server.Hostname()) {
 		log.Printf("WARNING: an unregistered client has attempted to connect: %s", conn.RemoteAddr().String())
 		return
 	}