Google Authenticator iRule Verification

The error could be caused by the slight difference between the way 11.3 and 11.6 parse Tcl.

In my experience it's usually due to the use of the

expr

Before:

HTTP::respond 301 Location "http://www.domain.org/blog/$DstPath/[expr ([string length [HTTP::query]]>0)?"?[HTTP::query]":""]"

After (note the added curly braces):

HTTP::respond 301 Location "http://www.domain.org/blog/$DstPath/[expr {([string length [HTTP::query]]>0)?"?[HTTP::query]":""}]"