How to confirm if udp 500, udp 4500 and upd 123 are open?

Confirm Ports UDP 500, UDP ... How does one confirm: Ports UDP 500, UDP 4500 and UPD 123 are open ? I must do this to determine why my T-Mobile Cell Spot Booster is not working. How do I know if these are open??
Subsequently, why are UDP ports 500 and 4500 blocked?
This error applies to IPsec VPN connections only. The firewall or the router is blocking UDP ports 500 and 4500. Check your local firewall or router configuration and allow traffic on those ports. If you don't have access to the firewall or router, for example, if you're in a hotel, connect through your mobile hotspot and try to connect again.
Thereof, how to check UDP port open at server side? netcat: Netcat is a utility for testing networks.nc -l –u 33001 is used to check UDP port open at the server side. Specify UDP (-u) and (-l) means listen modenc –u ip_address 33001 is used to check UDP port open at the client side. Provide the IP address and port.
Additionally, which is UDP port do you need to open ESP?
ESP = port 50. AH = port 51. and. UDP port 500. These are the ports you require to open up. In addition, if IPSec over udp is used then UDP port 10000 needs to be opened. As for ESP (Encapsulating Security Payload), please refer to RFC 2406 . and more info on the below url;
Similarly, why do we use UDP port 500 in IPSec VPN?
what is the reason and in what scenario we use UDP port 500 and UDP port 4500 in ipsec vpn?? UDP port 500 is the ISAKMP port for establishing PHASE 1 of IPSEC tunnnel.

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