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user_9352a0
1st Topic

Visitor

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2 Messages

Mon, May 10, 2021 9:29 PM

client server across xfinity gateway

We have a server application that allows client access. Clients inside the home network operate fine. We activate port forwarding and all looks good except we cannot get access to the server as xfinity is blocking ours and many other outside traffic. Can VPN or other service be used to allow connectivity to the server while reducing the attack traffic?

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1 m ago

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ComcastJoey

Official Employee

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338 Messages

1 m ago

Hello and Happy Wednesday, user_9352a0! I hope you’re having a great week so far! I also appreciate you taking a moment out of your day to reach out to us on our Community Forums! You’ve reached the best place and perfect person to help with virtually all of your account needs! Going forward, I'm truly sorry to hear about the traffic blockage to your remote server. In cases like this, it's probably best to create a Business account with us if your client devices are mainly accessing your server as there are also options to set up static IPs, etc that come with our business features. VPN might be a good workaround to try otherwise, I would get in contact with our Business support team to learn more. Thanks again for your time! 

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user_9352a0

Visitor

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2 Messages

@ComcastJoey static ip was easy, that is automatic when the port forward is set. We spent about 30 minutes on the phone with xfinity help desk who suggested we do the things already done and they suggested contacting modem manufacturer which we have not done yet. VPN seems to be a more secure option but we cannot seem to find suitable description of services provided. Client-Server emulates P2P, but not for our use, many are geared towards file transfer and hiding the IP where we need to link to the IP. We did try DMZ but we do not clearly understand this, it seems this allows access but with this enabled our client still reports that it is being blocked.  Please note: the client simply asks for the IP address of the server, when we have the client on our internal network and use the server IP it connects and works fine. If we use the public IP from that same PC it blocks. We would assume the xfinity network would allow traffic originating from its own network?

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1 m ago

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jlavaseur

Valued Contributor

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434 Messages

I have experienced in the past, the internal ip works great from within the network, if you use the public ip you need to be not on  the internal network for it to work, just a observation, I never investigated why

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1 m ago

ComcastTambrey

Official Employee

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2.7K Messages

Have you had the chance yet to reach out to the service admin that you are trying to connect to in order to see if the IP is being blocked? 

Alternatively, have you checked to see if this may be due to a firewall setting either on your gateway or on the server IP side?

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1 m ago

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EG

Expert

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87.2K Messages

@jlavaseur wrote:

I have experienced in the past, the internal ip works great from within the network, if you use the public ip you need to be not on  the internal network for it to work, just a observation, I never investigated why.

That's called *NAT loopback* or *Hairpinning*. It's disabled on most of not all routers for security reasons. You can Google for more info.

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1 m ago

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jlavaseur

Valued Contributor

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434 Messages

@EG thank you for that info, I never knew if I misconfigured something

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1 m ago

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