The following error appears when you install a certificate in a NetScaler appliance that is already installed with NetScaler nCore software release 9.3:
“Another synchronization is already in process, please try again later”.

To resolve the issue, complete the following steps:

1. Issue the following command to enable KAprobeUpdateLastActivity option:

   set ns tcpparam -KAprobeUpdateLastActivity enabled

2. Issue the following command to start the nsfsynd process:

   /netscaler/nsfsyncd –d

Problem Cause

The ns.conf file indicates that the KAProbeUpdateLastActivity option is not enabled.

BSD_6.3 [collector_172.16.254.118_P_16Mar2012_17_22] $ grep -i KAProbeUpdateLastActivity */*
nsconfig/ns.conf.1:set ns tcpParam -WS ENABLED -SACK ENABLED -learnVsvrMSS ENABLED -nagle ENABLED -KAprobeUpdateLastactivity DISABLED
nsconfig/ns.conf.2:set ns tcpParam -WS ENABLED -SACK ENABLED -learnVsvrMSS ENABLED -nagle ENABLED -KAprobeUpdateLastactivity DISABLED
nsconfig/ns.conf.3:set ns tcpParam -WS ENABLED -SACK ENABLED -learnVsvrMSS ENABLED -nagle ENABLED -KAprobeUpdateLastactivity DISABLED
nsconfig/ns.conf.4:set ns tcpParam -WS ENABLED -SACK ENABLED -learnVsvrMSS ENABLED -nagle ENABLED -KAprobeUpdateLastactivity DISABLED
nsconfig/ns.conf.NS9.3-48.6:set ns tcpParam -WS ENABLED -SACK ENABLED -learnVsvrMSS ENABLED -nagle ENABLED -KAprobeUpdateLastactivity DISABLED

The following error messages are recorded in the ns.log file:

BSD_6.3 [log] $ grep "ERROR: Another synchronization is already in process, please try again later" ns.log*
ns.log.0:Mar 16 15:01:28 <local0.info> 172.16.254.118 03/16/2012:19:01:28 GMT ns PPE-0 : UI CMD_EXECUTED 308436 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.0:Mar 16 15:17:35 <local0.info> 172.16.254.118 03/16/2012:19:17:35 GMT ns PPE-0 : UI CMD_EXECUTED 308511 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.1:Mar 16 14:18:04 <local0.info> 172.16.254.118 03/16/2012:18:18:04 GMT ns PPE-0 : UI CMD_EXECUTED 308306 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.1:Mar 16 14:18:17 <local0.info> 172.16.254.118 03/16/2012:18:18:17 GMT ns PPE-0 : UI CMD_EXECUTED 308312 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.1:Mar 16 14:18:48 <local0.info> 172.16.254.118 03/16/2012:18:18:48 GMT ns PPE-0 : UI CMD_EXECUTED 308331 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files all" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.1:Mar 16 14:39:38 <local0.info> 172.16.254.118 03/16/2012:18:39:38 GMT ns PPE-0 : UI CMD_EXECUTED 308349 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"
ns.log.1:Mar 16 14:41:50 <local0.info> 172.16.254.118 03/16/2012:18:41:50 GMT ns PPE-0 : UI CMD_EXECUTED 308363 :  User nsroot - Remote_ip 172.16.55.74 - Command "sync HA files ssl" - Status "ERROR: Another synchronization is already in process, please try again later"

You can also note that the nsfsyncd process is not running:

BSD_6.3 [shell] $ grep sync ps-auxwr.out
root 51 0.0 0.0 0 16 ?? DL 28Nov11 61:12.91 [syncer]
root 881 0.0 0.0 5136 1316 ?? I 28Nov11 0:00.12 sh /netscaler/nssync.sh start
root 14659 0.0 0.1 18040 3848 ?? I 6:46AM 0:00.01 /netscaler/nssync