Kung unclickable o greyed out ang Connect button sa VPN app (like HTTP Custom, HC, or Netmod):
1. Make sure na na-import mo nang maayos ang valid config file at may napiling server.
2. I-check kung may active screen overlay app (like blue light filter, floating bubbles, or recorder) na humaharang sa Android VPN permission pop-up.
3. I-force stop at i-clear cache ang app sa Settings > Apps bago mag-connect ulit.