TCP Keep-alive timer changed from 2 minutes in SGOS 4.x to 2 hours in SGOS 5.x
Affected products and versions
ProxySG 184.108.40.206 and later
ProxySG OS versions 220.127.116.11 and later has an RFC compliant TCP Keep-alive timer of 2 hours. According to RFC1122, section 18.104.22.168:
However, this was not the implementation in SGOS 4.x. In version 4.x, the keep-alive timer was set to 2 minutes (120 seconds). Because of this implementation and the long history of SGOS 4, some Blue Coat customers may have implementations which rely on the shorter keep-alive timer.
While the issue, strictly speaking is not a violation of established standards, it is a change in functionality. Therefore, Blue Coat has released a new version of SGOS 5.x (22.214.171.124) which provides a Command Line Interface command switch to allow an administrator to globally change the TCP Keep-alive timer. The range will be anywhere from 60 seconds (1 minute) and 7200 seconds (2 hours).
There is no workaround presently available in SGOS 5. A fix is available in SGOS 126.96.36.199.
This issue was resolved in SGOS 188.8.131.52. The TCP-IP keepalive timeout can now be set, a range of 1 minute to 2 hours can be selected (60 and 7200 seconds). This can be done using the following command in the ProxySG Command Line Interface in Config Terminal mode:
Administrators can view the current keepalive timeout with the following command:
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