fluent/fluentd · error · Fluent::ConfigError

Either of 'host' and 'network' must be specified for client

Error message

Either of 'host' and 'network' must be specified for client

What it means

Error "Either of 'host' and 'network' must be specified for client" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/plugin/in_forward.rb:141

      raise Fluent::ConfigError, "'tag' parameter must not be empty" if @tag && @tag.empty?
      raise Fluent::ConfigError, "'add_tag_prefix' parameter must not be empty" if @add_tag_prefix && @add_tag_prefix.empty?

      if @security
        if @security.user_auth && @security.users.empty?
          raise Fluent::ConfigError, "<user> sections required if user_auth enabled"
        end
        if !@security.allow_anonymous_source && @security.clients.empty?
          raise Fluent::ConfigError, "<client> sections required if allow_anonymous_source disabled"
        end

        @nodes = []

        @security.clients.each do |client|
          if client.host && client.network
            raise Fluent::ConfigError, "both of 'host' and 'network' are specified for client"
          end
          if !client.host && !client.network
            raise Fluent::ConfigError, "Either of 'host' and 'network' must be specified for client"
          end
          source = nil
          if client.host
            begin
              source = IPSocket.getaddress(client.host)
            rescue SocketError
              raise Fluent::ConfigError, "host '#{client.host}' cannot be resolved"
            end
          end
          source_addr = begin
                          IPAddr.new(source || client.network)
                        rescue ArgumentError
                          raise Fluent::ConfigError, "network '#{client.network}' address format is invalid"
                        end
          @nodes.push({
              address: source_addr,
              shared_key: (client.shared_key || @security.shared_key),
              users: client.users

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/plugin/in_forward.rb:141 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of fluent/fluentd@dd45c6e18d (2026-08-21). Data as JSON: /api/errors/a46da719e04d6609. Report an issue: GitHub.