I have a same problem with this : How to enable bmcweb in openbmc.
The only diff is that I want to use evb-ast2600.
I tried with openbmc's source (https://github.com/openbmc/openbmc) and aspeed's source(https://github.com/AspeedTech-BMC/openbmc), but both are failed in same way.
I can login BMC, but an't be reached refused to connect <ERR_CONNECTION_REFUSED>.
This is the SAME way I tried.
git clone https://github.com/openbmc/openbmccd openbmcsource setup evb-ast2600bitbake obmc-phosphor-image