Unknown ports open on GL 750

Ronniej · 2021-09-08T22:24:06.504Z

Hi,
I ran a port scan on router from LAN & noticed below ports are opened.
First 3 I understand are for management and DNS, what are the last 3 (139, 443, 445)?

I disabled DLNA & file sharing but these are still persisting.

PORT STATE SERVICE
22/tcp open ssh
53/tcp open domain
80/tcp open http
83/tcp open mit-ml-dev
139/tcp filtered netbios-ssn
443/tcp open https
445/tcp filtered microsoft-ds

alzhao · 2021-09-09T09:57:10.016Z

443 is https access to the UI.

139 and 445 is for file sharing. How did you turn off file sharing? The process should still run on the router.

Ronniej · 2021-09-09T11:43:40.411Z

By disabling it in the applications on main page… disabled DLNA and file sharing, I thought it would have.

What about 83 ?

David · 2021-09-09T13:54:51.123Z

port 831225×105 8.58 KB

alzhao · 2021-09-10T09:38:12.969Z

83 port was used in old firmware to access the router from wan side if you enable but this was abandoned very long time ago.

Which firmware is this

David · 2021-09-10T15:08:44.326Z

3.203-0701 in AR750S
I made a restore config from backup after upgrade firmware, that’s why is still there.

David · 2021-09-10T15:10:54.276Z

Ronniej:

83/tcp open mit-ml-dev

Is it the same function port that Ronniej is talking about?

Ronniej · 2021-09-10T23:17:05.476Z

Thanks guys.
I’m running version 3.203, quite latest.

I tested from LAN side again and didn’t see it, not sure where it’s gone now.

I’ll setup a vulnerability scanner to do regular checkup on all my devices to lookout for any security loopholes.