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KB-1206 "Communications link failure during rollback(). Transaction resolution unknown" error thrown in application server log


The following error is displayed in application server log:

INFO  [stdout] (ajp-/ 2016-07-06 13:16:52,016 [ajp-/] ERROR org.hibernate.util.JDBCExceptionReporter - Statement cancelled due to timeout or client request
WARN  [com.arjuna.ats.jta] (ajp-/ ARJUNA016045: attempted rollback of < formatId=131077, gtrid_length=29, bqual_length=36, tx_uid=0:ffffac176096:b16e:5776f2fb:4971, node_name=1, branch_uid=0:ffffac176096:b16e:5776f2fb:4975, subordinatenodename=null, eis_name=0 > (org.apache.commons.dbcp2.managed.LocalXAConnectionFactory$LocalXAResource@420114fe) failed with exception code ARJUNA016099: Unknown error code:0: javax.transaction.xa.XAException
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown.


One of the possible causes is the mismatch of the maximum transmission unit (MTU) between the client and server.


To determine the MTU value, run the following command:


This will display the eth0 configurations, along with the MTU value.

To set a new value for the MTU:

ifconfig eth0:0 <IP ADDRESS> netmask mtu <NEW MTU VALUE>

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: March 2017