ProxyPass v10/v11

The error message:

/Common/ProxyPass_LTMV12:119: warning: [unmatched closing character][}]

Tells us that the 'warning' is on line 119:

119     set serverside [string trimleft [getfield $ppass " " 2 ] "{" ]
120     set newpool [string trimright [getfield $ppass " " 3 ] "}" ]

So it's complaining about the curly brace in the string command. You can escape the curly braces to prevent that warning:

119     set serverside [string trimleft [getfield $ppass " " 2 ] "\{" ]
120     set newpool [string trimright [getfield $ppass " " 3 ] "\}" ]

Basic testing indicates that this syntax will not be a problem:

 tclsh
% set astring {\{ this is a string}
\{ this is a string
% string trimleft $astring "\{"
\{ this is a string
% set astring "{this is a string"
{this is a string
% string trimleft $astring "\{"
this is a string
%

I have updated my above comment to reflect this change.