SMTP IsAlive Timeout
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When sending a message, detailed information on each address thatfails is available in anSMTPAddressFailedExceptionchained off the top levelSendFailedExceptionthat is thrown.In addition, if the mail.smtp.reportsuccess propertyis set, anSMTPAddressSucceededExceptionwill be included in the list for each address that is successful.Note that this will cause a top levelSendFailedExceptionto be thrown even though the send was successful.
To use SMTP authentication you'll need to set the mail.smtp.authproperty (see below) or provide the SMTP Transportwith a username and password when connecting to the SMTP server. Youcan do this using one of the following approaches:
When using DIGEST-MD5 authentication,you'll also need to supply an appropriate realm;your mail server administrator can supply this information.You can set this using the mail.smtp.sasl.realm property,or the setSASLRealm method on SMTPTransport.
The SMTP protocol provider supports the CHUNKING extension defined inRFC 3030.Set the mail.smtp.chunksize property to the desired chunksize in bytes.If the server supports the CHUNKING extension, the BDAT command will beused to send the message in chunksize pieces. Note that no pipelining isdone so this will be slower than sending the message in one piece.Note also that the BINARYMIME extension described in RFC 3030 is NOT supported.
If you previously set a session inactivity timeout in the web.config (WebClientStatefulSessionTimeoutInSeconds key) through a support request, then that old value will still be honored. The change in default will only affect those who had not explicitly set a new session inactivity timeout in the web config.
If you set the value to greater than 30, you will be prompted to confirm your selection. The confirmation prompt says "Increasing the inactivity session timeout can cause extra load on your system, which can lead to a decrease in performance. Are you sure you want to continue?" The higher the value, the higher the load will be, which can affect negatively system performance. Select Yes to save the changes, or No to revert to the existing value.
To give users awareness of an impending session suspension due to inactivity and to help prevent users from losing any unsaved changes when this occurs, users will be notified before their sessions are set to be terminated due to inactivity and given an opportunity to reconnect. The notice given to the user is dependent on the Session inactivity timeout setting.
If SMTP server is not reachable, the ping request will timeout. However, some SMTP servers are configured to explicitly block ping requests. Thus, even if the ping packet timeouts, you should still try to telnet the SMTP server unless absolutely sure that ping command should not be blocked.
Most probably though, if ping command timeouts, the server address is not reachable. If SMTP server does not work, although its IP address is reachable by ping command, the SMTP server software might not be running on the specified machine · Ping server regularly
When telnet terminal is open, we can now continue with SMTP connectivity testing. To connect to the SMTP server, type: o smtp.example.com 25 in telnet command prompt (where smtp.example.com should be replaced by actual SMTP server and 25 by the actual SMTP server port).
Setting communication timeouts is very important to improve thecommunication process. They help to detect problems and stabilisea distributed system. JK can use several different timeout types, whichcan be individually configured. For historical reasons, all of them aredisabled by default. This HowTo explains their use and giveshints how to find appropriate values.
All timeouts can be configured in the workers.properties file.For a complete reference of all worker configurationitems, please consult the worker reference.This page assumes, that you are using at least version 1.2.16 of JK.Dependencies on newer versions will be mentioned where necessary.
CPing/CPong is our notion for using small test packets to check thestatus of backend connections. JK can use such test packets directly after establishinga new backend connection (connect mode) and also directly before each request getssend to a backend (prepost mode).Starting with version 1.2.27 it can also be used when a connection was idlefor a long time (interval mode).The maximum waiting time (timeout) for a CPong answer to a CPing and the idletime in interval mode can be configured.
The worker attribute ping_mode can be set to a combination of charactersto determine, in which situations test packets are used:C: connect mode, timeout ping_timeout overwritten by connect_timeoutP: prepost mode, timeout ping_timeout overwritten by prepost_timeoutI: interval mode, timeout ping_timeout, idle time connection_ping_intervalA: all modes
Activating the CPing probing via ping_mode has been added in version 1.2.27.For older versions only the connect and prepost modes exist and must be activated byexplicitely setting connect_timeout and prepost_timeout.
The worker attribute ping_timeout sets the default wait timeoutin milliseconds for CPong for all modes. By default the value is "10000"milliseconds. The value only gets used, if you activate CPing/Cpong probesvia ping_mode. The default value should be fine, except if you experiencevery long Java garbage collection pauses.Depending on your network latency and stability, good custom valuesoften are between 5000 and 15000 milliseconds.You can overwrite the timeout used for connect and prepost mode withconnect_timeout and prepost_timeout.Remember: don't use extremely small values.
The worker attribute connect_timeout sets the wait timeoutin milliseconds for CPong during connection establishment. You can use itif you want to overwrite the general timeout set with ping_timeout.To use connect mode CPing, you need to enable it via ping_mode.Since JK usually uses persistent connections, opening new connections is arare event. We therefore recommend activating connect mode.Depending on your network latency and stability, good values oftenare between 5000 and 15000 milliseconds.Remember: don't use extremely small values.
The worker attribute prepost_timeout sets the wait timeoutin milliseconds for CPong before request forwarding. You can use itif you want to overwrite the general timeout set with ping_timeout.To use prepost mode CPing, you need to enable it via ping_mode.Activating this type of CPing/CPong adds a small latency to eachrequest. Usually this is small enough and the benefit of CPing/CPong is more important.So in general we also recommend using prepost_timeout.Depending on your network latency and stability, good values oftenare between 5000 and 10000 milliseconds.Remember: don't use extremely small values.
Until version 1.2.27 ping_mode and ping_timeout did notexist and to enable connect or prepost mode CPing you had to set connect_timeoutrespectively prepost_timeout to some reasonable positive value.
Some platforms allow to set timeouts for all operations on TCP sockets.This is available for Linux and Windows, other platforms do not support this,e.g. Solaris. If your platform supports TCP send and receive timeouts,you can set them using the worker attribute socket_timeout.You can not set the two timeouts to different values.
JK will accept this attribute even if your platform does not supportsocket timeouts. In this case setting the attribute will have no effect.By default the value is "0" and the timeout is disabled.You can set the attribute to some seconds value (not: milliseconds).JK will then set the send and the receive timeouts of the backendconnections to this value. The timeout is low-level, it isused for each read and write operation on the socket individually.
Using this attribute will make JK react faster to some types of network problems.Unfortunately socket timeouts have negative side effects, because for mostplatforms, there is no good way to recover from such a timeout, once it fired.For JK there is no way to decide, if this timeout fired because of real networkproblems, or only because it didn't receive an answer packet from a backend in time.So remember: don't use extremely small values.
For the general case of connection establishment you can usesocket_connect_timeout. It takes a millisecond value and workson most platforms, even if socket_timeout is not supported.We recommend using socket_connect_timeout because in some networkfailure situations failure detection during connection establishmentcan take several minutes due to TCP retransmits. Depending on the qualityof your network a timeout somewhere between 1000 and 5000 millisecondsshould be fine. Note that socket_timeout is in seconds, andsocket_connect_timeout in milliseconds.
JK allows connections in the pool to get closed after some idle time.This maximum idle time can be configured with the attributeconnection_pool_timeout which is given in units of seconds.The default value is "0", which disables closing idle connections.
We generally recommend values around 10 minutes, so settingconnection_pool_timeout to 600 (seconds). If you use this attribute,please also set the attribute keepAliveTimeout(if it is set explicitly) or connectionTimeout in the AJPConnector element of your Tomcat server.xml configuration file toan analogous value. Caution: keepAliveTimeout andconnectionTimeout must be given in milliseconds.So if you set JK connection_pool_timeout to 600, you should set TomcatkeepAliveTimeout or connectionTimeout to 600000.
JK connections do not get closed immediately after the timeout passed.Instead there is an automatic internal maintenance taskrunning every 60 seconds, that checks the idle status of all connections.The 60 seconds intervalcan be adjusted with the global attribute worker.maintain. We do notrecommend to change this value, because it has a lot of side effects.Until version 1.2.26, the maintenance task only runs, if requests getprocessed. So if your web server has processes that do not receive anyrequests for a long time, there is no way to close the idle connectionsin its pool. Starting with version 1.2.27 you can configure an independentwatchdog thread when using Apache HTTP Server 2.x with threaded APR or Microsoft IIS. 2b1af7f3a8