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NVR_remote_view

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NVR remote viewing

I'm trying to open three ports but tech support for the nvr is stating that the modem provider is preventing me from opening the ports

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chris_c21

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Which ports are they? Cox does block some ports, as explained on this page:

PortTransportProtocolDirectionReason for Filtering
25 TCP SMTP Both
 
Note: SMTP is only permitted outbound to Cox-provided SMTP servers.		 SMTP Relays
80 TCP HTTP Inbound Web servers, worms
135 UDP NetBios Both Net Send Spam / Pop-ups, Worms
136-139 UDP, TCP NetBios Both Worms, Network Neighborhood
445 TCP MS-DS/ NetBios Both Worms, Network Neighborhood
1433 TCP MS-SQL Inbound Worms, Trojans
1434 UDP MS-SQL Inbound Worms, SQLslammer
1900 UDP MS-DS / NetBios Both Worms, Network Neighborhood

 
Explanations Of Filtered Ports
 

PortExplanation
25 / TCP - SMTP Mail servers use Simple Mail Transport Protocol (SMTP) to exchange email. We block this to protect upstream bandwidth and prevent customers from running open relays could potentially be used by others to send spam via our network.
80 / TCP - HTTP Web browsers use Hypertext Transport Protocol (HTTP) to communicate with web servers. In addition to protecting bandwidth by preventing customers from running high-traffic web servers, we can stop many destructive worms that spread through security holes in web server software.
135, 137 / UDP, 135, 139 / TCP, 445 MS-DC – NetBIOS NetBIOS, also known as Server Message Block, LanManager, and Common Internet File System, are networked file sharing protocols. The Microsoft Windows Network Neighborhood runs over NetBIOS. Cox filters these ports to protect customers from exposing files on their computers, and to block worms which spread through open file shares. The latest addition to this series, a consolidated service port, such as TCP445, has also opened new similar security risks in Win2K and WinXP.
1433 / TCP, 1434 / UDP –
MS-SQL		 Microsoft SQL Server is a database application with a long history of security exploits, and is noted for the propagation of the SQLslammer worm. These ports are filtered to prevent exploitation and propagation of such MS-SQL exploits.
1900 / UDP - UPnP Discovery / SSDP is a service that runs by default on WinXP. It creates an immediately exploitable security vulnerability for any network. Filtering this port proactively prevents XP systems from being remotely compromised by malicious worms or intruders.

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NVR_remote_view

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NVR_remote_view

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How can I get that port opened. 

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ColleenD

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NVR remote viewing, 

As stated previously by chris_c21, some ports are filtered for reasons listed in the article referenced above. Settings for the particular ports listed at http://www.cox.com/residential/support/internet/article.cox?articleId=cacf82f0-6407-11df-ccef-000000000000 can't be changed.

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NVR_remote_view

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So customers of mine that have cox Internet will not be able to view their home camera system? Their best bet is to change Internet providers?

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turtle-speed

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change the IP and port used on the cam/dvr end. Will work fine

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Tecknowhelp

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If the DVR system needs outbound port 80,  then yes. But it looks like it can use port 8080 too, which Cox doesn't block, so use that. There is no performance difference between the ports. 

What router/gateway do you have? In general, if you have a home DVR/PVR(not TV) system, you shouldn't have a gateway. They can have issues with the DDNS and port triggering sometimes needed. 

Last, how many camera's do you have? Do you want to remote view all? If so, you will have to create DHCP reservations for each then port triggers, IE 68.x.x.x:8080>192.168.1.5:8080 and 68.x.x.x:8081>192.168.1.6:8080 and so on. 

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