Evening and welcome
Do you have defense+ Installed?
If so, Boot In Safe Mode > Open Firewall > Right Click Icon > Defense+ Security level > Training Mode or Disabled
Did This Solve Your Issue?
If not, Boot In Safe Mode > Open Firewall > Defense+ > Advance > Computer Security Policy > Defense+ Settings > Deactivate The Defense+ Permanently
Did This Solve?
If Not,
If so, Boot In Safe Mode > Open Firewall > Misc > Diagnostics
Did This Solve?
If Not, Uninstall Comodo Firewall
Use Revo Uninstaller(ATTACHED) > Select Comodo Firewall > Moderate
Then Install It Once More From The Download Page
http://www.personalfirewall.comodo.com/download_firewall.html(Personal Question: How is your Lenovo, I Think I might buy one

)
CG