Efexs wrote

To get web interface you need to close eap controller

You need to forget the EAP managed by the controller in order to re-activate its web UI. Closing the controller will not dis-associate the EAP from it.

chip_21 wrote

After closing EAP controller internal web server works, but now I can not add AP to EAP controller again. The software does not see AP.
Does not help reinstalling software and resetting AP.

No idea. Forgetting an EAP, then closing or restarting the EAC and later adopting the same EAP a second or a third time works for me even without restoring the EAP's firmware.

Maybe Windows or the EAC causes troubles. Probably it could help to just re-install the EAC to get rid of its former internal states.