1. Home
  2. Server Administration
  3. Squid. The definitive guide

authenticate_ttl

authenticate_ttl

Squid maintains a cache of proxy authentication usernames and credentials. Squid periodically removes unused entries to keep memory usage down. This directive specifies how long Squid keeps entries in the proxy authentication username cache. A user's TTL is extended each time Squid receives a request from that user.

This directive doesn't determine how long credentials remain valid. It only affects whether or not an entry is removed from the username cache. Squid may decide to revalidate the credentials of a user that is in the cache. Each authentication scheme has its own way of determining when to revalidate credentials with the external helper.


Syntax

 
authenticate_ttl time-specification

Default

 
authenticate_ttl 1 hour

Example

 
authenticate_ttl 30 minutes

Related

authenticate_cache_garbage_interval, auth_param



    		Preface
    		Chapter 1. Introduction
    		Chapter 2. Getting Squid
    		Chapter 3. Compiling and Installing
    		Chapter 4. Configuration Guide for the Eager
    		Chapter 5. Running Squid
    		Chapter 6. All About Access Controls
    		Chapter 7. Disk Cache Basics
    		Chapter 8. Advanced Disk Cache Topics
    		Chapter 9. Interception Caching
    		Chapter 10. Talking to Other Squids
    		Chapter 11. Redirectors
    		Chapter 12. Authentication Helpers
    		Chapter 13. Log Files
    		Chapter 14. Monitoring Squid
    		Chapter 15. Server Accelerator Mode
    		Chapter 16. Debugging and Troubleshooting
    		Appendix A. Config File Reference
    		http_port
    		https_port
    		ssl_unclean_shutdown
    		icp_port
    		htcp_port
    		mcast_groups
    		udp_incoming_address
    		udp_outgoing_address
    		cache_peer
    		cache_peer_domain
    		neighbor_type_domain
    		icp_query_timeout
    		maximum_icp_query_timeout
    		mcast_icp_query_timeout
    		dead_peer_timeout
    		hierarchy_stoplist
    		no_cache
    		cache_access_log
    		cache_log
    		cache_store_log
    		cache_swap_log
    		emulate_httpd_log
    		log_ip_on_direct
    		cache_dir
    		cache_mem
    		cache_swap_low
    		cache_swap_high
    		maximum_object_size
    		minimum_object_size
    		maximum_object_size_in_memory
    		cache_replacement_policy
    		memory_replacement_policy
    		store_dir_select_algorithm
    		mime_table
    		ipcache_size
    		ipcache_low
    		ipcache_high
    		fqdncache_size
    		log_mime_hdrs
    		useragent_log
    		referer_log
    		pid_filename
    		debug_options
    		log_fqdn
    		client_netmask
    		ftp_user
    		ftp_list_width
    		ftp_passive
    		ftp_sanitycheck
    		cache_dns_program
    		dns_children
    		dns_retransmit_interval
    		dns_timeout
    		dns_defnames
    		dns_nameservers
    		hosts_file
    		diskd_program
    		unlinkd_program
    		pinger_program
    		redirect_program
    		redirect_children
    		redirect_rewrites_host_header
    		redirector_access
    		redirector_bypass
    		auth_param
    		authenticate_ttl
    		authenticate_cache_garbage_interval
    		authenticate_ip_ttl
    		external_acl_type
    		wais_relay_host
    		wais_relay_port
    		request_header_max_size
    		request_body_max_size
    		refresh_pattern
    		quick_abort_min
    		quick_abort_max
    		quick_abort_pct
    		negative_ttl
    		positive_dns_ttl
    		negative_dns_ttl
    		range_offset_limit
    		connect_timeout
    		peer_connect_timeout
    		read_timeout
    		request_timeout
    		persistent_request_timeout
    		client_lifetime
    		half_closed_clients
    		pconn_timeout
    		ident_timeout
    		shutdown_lifetime
    		acl
    		http_access
    		http_reply_access
    		icp_access
    		miss_access
    		cache_peer_access
    		ident_lookup_access
    		tcp_outgoing_tos
    		tcp_outgoing_address
    		reply_body_max_size
    		cache_mgr
    		cache_effective_user
    		cache_effective_group
    		visible_hostname
    		unique_hostname
    		hostname_aliases
    		announce_period
    		announce_host
    		announce_file
    		announce_port
    		httpd_accel_host
    		httpd_accel_port
    		httpd_accel_single_host
    		httpd_accel_with_proxy
    		httpd_accel_uses_host_header
    		dns_testnames
    		logfile_rotate
    		append_domain
    		tcp_recv_bufsize
    		err_html_text
    		deny_info
    		memory_pools
    		memory_pools_limit
    		forwarded_for
    		log_icp_queries
    		icp_hit_stale
    		minimum_direct_hops
    		minimum_direct_rtt
    		cachemgr_passwd
    		store_avg_object_size
    		store_objects_per_bucket
    		client_db
    		netdb_low
    		netdb_high
    		netdb_ping_period
    		query_icmp
    		test_reachability
    		buffered_logs
    		reload_into_ims
    		always_direct
    		never_direct
    		header_access
    		header_replace
    		icon_directory
    		error_directory
    		maximum_single_addr_tries
    		snmp_port
    		snmp_access
    		snmp_incoming_address
    		snmp_outgoing_address
    		as_whois_server
    		wccp_router
    		wccp_version
    		wccp_incoming_address
    		wccp_outgoing_address
    		delay_pools
    		delay_class
    		delay_access
    		delay_parameters
    		delay_initial_bucket_level
    		incoming_icp_average
    		incoming_http_average
    		incoming_dns_average
    		min_icp_poll_cnt
    		min_dns_poll_cnt
    		min_http_poll_cnt
    		max_open_disk_fds
    		offline_mode
    		uri_whitespace
    		broken_posts
    		mcast_miss_addr
    		mcast_miss_ttl
    		mcast_miss_port
    		mcast_miss_encode_key
    		nonhierarchical_direct
    		prefer_direct
    		strip_query_terms
    		coredump_dir
    		ignore_unknown_nameservers
    		digest_generation
    		digest_bits_per_entry
    		digest_rebuild_period
    		digest_rewrite_period
    		digest_swapout_chunk_size
    		digest_rebuild_chunk_percentage
    		chroot
    		client_persistent_connections
    		server_persistent_connections
    		pipeline_prefetch
    		extension_methods
    		request_entities
    		high_response_time_warning
    		high_page_fault_warning
    		high_memory_warning
    		ie_refresh
    		vary_ignore_expire
    		sleep_after_fork
    		Appendix B. The Memory Cache
    		Appendix C. Delay Pools
    		Appendix D. Filesystem Performance Benchmarks
    		Appendix E. Squid on Windows
    		Appendix F. Configuring Squid Clients