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[rdpjeff]

I have had my DLINK D-655 configured and working to use Virtual Servers such that I can RDP from outside my network and access those systems for some time.  Suddenly, it stops working.  D-655 sits behind Comcast modem, but DIR-655 does all the work acting as DHCP Server.  I use the external fixed IP address from Comcast with a different port for the systems I want to get to.  Has worked fine, can't see anything that could be a problem but can't get to my systems from the outside anymore.  Ideas of what to check??  Something change on the comcast modem?  Something change on the DIR-655??

[FurryNutz]

What model is the ISP modem?
What FW version is currently loaded?

Does power cycling the router and modem do anything?

[rdpjeff]

Hardware version on Dlink is 4A and Firmware is 1.21.
Comcast modem is SMC Networks hardware version 1.01 and firmware version 3.1.6.54.
Power cycling did not change the Dlink inability to allow the remote access.  smcd3g-ccr is the model number of the device. 
What can be seen via logs about why this stopped working?

[FurryNutz]

Possible something may have changed on the ISP services. Routers not do anything unless the users changes the configuration or the power supply goes bad.

• If this modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>Double NAT and How NAT Works. To tell if the modem is bridged or not, look at the routers web page, Status/Device Info/Wan Section, if there is a 192.168.0.# address in the WAN IP address field, then the modem is not bridged. If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ.
• Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values
• For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.

Router and Wired Configurations
Some things to try: - Log into the routers web page at 192.168.0.1. Use IE, Opera or FF to manage the router.

• Turn off ALL QoS or Disable Traffic Shaping (DIR only) GameFuel (DGL only and if ON.) options, Advanced/QoS or Gamefuel.
• Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual or under Setup/PARENTAL CONTROL/Set to>None: Static IP or Obtain Automatically From ISP.
• Enable Use Unicasting (compatibility for some ISP DHCP Servers) under Setup/Internet/Manual.
• Turn on DNS Relay under Setup/Networking. Link>Finding Faster DNS Addresses using Name Bench
• Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting.
• Ensure devices are set to auto obtain an IP address.
• If IPv6 is an option on the router, select Local Connection Only or Disable IPv6 options under Setup/IPv6.
• Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall. Enable or Disable SPI to test.
• Enable uPnP and Multi-cast Streaming under Advanced/Networking. Disable uPnP for testing Port Forwarding rules. Enable IPv6 Multi-cast Streaming for routers that have a Media Server option. Disable IPv6 Multi-cast Streaming if IPv6 or Media Server is not being used.
• Turn off WISH, and WPS under Advanced.
• WAN Port Speed set to Auto or specific speed? Some newer ISP modems support 1000Mb so manually setting to Gb speeds can be supported by the router. Advanced/Advanced Networking/WAN Port Speed
• Set current Time Zone, Date and Time. Use an NTP Server feature. Tools/Time.
• Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.

I recommend that you have your ISP check the cabling going to the ISP modem, check signal levels going to the ISP modem. Check for t.v. line splitters and remove them as they can introduce noise on the line and lower the signal going to the ISP modem. Connecting to the ISP modem could result in a false positive as the signal to the modem could be just enough to that point then adding on a router, could see problems. The router operation is dependent upon getting good data flow from the ISP modem and the modem is dependent upon getting good signal from the ISP Service.

Save your routers config settings to file under Tool/System. Do a factory reset. Reload the config from file...test. If fails, factory reset once more then setup from scratch with out reloading the config file...test...

[FurryNutz]

Any status on this?