This may or may not be a tclhttpd problem:

tclhttpd hangs and does not respond to a command-line starkit update request when serving a cgi script that runs starsync server. The same cgi script can run on Apache and nginx (of course, with appropriate extensions to run cgi scripts). 

The cgi script is created according to the instructions here: 
https://equi4.com/papers/skpaper7_3.html

When this cgi script is put under the cgi-bin directory of tclhttpd, there is no response and it looks like this:

tclkit sdx.kit update -n -from http://localhost:8015/cgi-bin/sync my.kit
 MY: comparing with http://localhost:8015/cgi-bin/sync ...

I did some search and found that one other person encountered a similar problem:

https://equi4.com/pipermail/starkit/2005-July/002462.html

My guess is that maybe tclhttpd does not like the 'exec' command in the cgi script?

thanks

Dr. Koru
Information Systems
UMBC