Ports 88 and 89 open with Eddie

[MersennePrime 1]

When I checked to see if any ports are open while using AIRVPN, ports 88 and 89 showed to be open on a couple of websites that can be used to determine the status of your ports.

 

PORT STATE SERVICE

80/tcp filtered http

81/tcp filtered hosts2-ns

82/tcp filtered xfer

83/tcp filtered mit-ml-dev

84/tcp filtered ctf

85/tcp filtered mit-ml-dev

86/tcp filtered mfcobol

87/tcp filtered priv-term-l

88/tcp open kerberos-sec

89/tcp open su-mit-tg

90/tcp filtered dnsix

 

I did open a port but it's situated far beyond the first 1024. So, why are these ports open - and is this state of affairs a reason for any concern at all?

Additionally, I wanted to re-check what port (or ports) I had opened in the port-forwarding service - but I couldn't find any information in the client area.

Where can I find out what ports are open and how can I close them again?