We are seeing that all our customers in the Brighthouse Orlando, FL market
that would make outbound connections on TCP port 3306 suddenly can't
connect to us now. This happened suddenly mid day today.
Other ISPs can still make the same outbound connections. VPN connections on
Brighthouse into the same IP block work fine, just outbound port 3306 is
being blocked now.
If anyone has details as to an emergency maintenance or change that
occurred, I'd like to be able to pass it along to our customers.
Thanks,
Jared
Speculation: are these residential class cablemodem customers? Carriers
are prone to block uncommon ports on such modems at random.
Cheers,
-- jra
Yeah, 3306 is MySQL. Overly-paranoid firewall somewhere? DDoS
mitigation collateral damage?
Jeff
>> From: "Jared Geiger" <jared@compuwizz.net>
>>
>> We are seeing that all our customers in the Brighthouse Orlando, FL
market
>> that would make outbound connections on TCP port 3306 suddenly can't
>> connect to us now. This happened suddenly mid day today.
>>
>> Speculation: are these residential class cablemodem customers? Carriers
>> are prone to block uncommon ports on such modems at random.
Yeah, 3306 is MySQL. Overly-paranoid firewall somewhere? DDoS
mitigation collateral damage?
I routed around nlayer>TWC>Brighthouse to Cogent>XO>Brighthouse and problem
was resolved. So the first path has something wonky. The reverse path is
Level3>Inforelay>Me.
So my guess is there is something in nlayer or TWC 7843 that is
filtering/limiting it.