For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

santosh_81454's avatar
santosh_81454
Icon for Nimbostratus rankNimbostratus
Jan 19, 2012

Error : .tcp_parse_options: Illegal window scaling value 109 >14

Hello, we have two 5100 bigip units running v9.1.2. Recently we started receiving the error message as below under the /var/log/messages file. When this message occurs, the LTM stops processing traffi...
management
monitoring
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Jan 19, 2012
Hi Santosh,

 

 

The only reference I could find to that illegal window scaling value error is from a single case where the escalation engineer suggested this was an issue with a host on the network not supporting RFC 1323 for window scaling.

 

 

I don't know what the actual issue is or whether an upgrade would improve LTM's handling of it. But the 5100 platform can run 9.3.x or 9.4.x. If you had support on the unit as of 2007-10-09 you could upgrade the unit to 9.3.1. For 9.4.8 you'd need to have had support for the unit on 2009-05-27. See SOL7717 for details:

 

 

http://support.f5.com/kb/en-us/solutions/public/7000/700/sol7727.html

 

 

Aaron