I have four computers (3 wireless, 1 direct) connected to my D-LINK 614+ router. MY ISP is Optimum Online. Last week, all three computers linked wirelessly to the router lost the ability to send email via Outlook Express. However, the computer connected directly to an Ethernet port could still do so. Attempts to send an email via the Optonline mail server results in the following message: The connection to the server has failed. Account: 'optimum mail', Server: 'mail.optonline.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket Error: 10060, Error Number: 0x800CCC0E This is error occurs on each computer, so I believe the problem must be within the router rather than an individual machine. I should mention that receiving email via port 110 on each machine is working fine. Optonline tech support tried to fix the problem but was unsuccessful. I tried using telnet to directly access the mail server. It worked fine for port 110, but failed every time to address port 25. To confirm this wasn't a problem with the Optonline mail server, I tried another mail server (my work machine)and port 25 would not function on this server either (the same message was generated). However, on my job's mail server I was able to select a different port (587) for SMTP. This immediately allowed me to send email via Outlook Express. Therefore, I concluded that the problem must be the router will not allow access to port 25 for wireless clients. I reset the router to factory defaults, but this didn't work. I re-flashed the router with the latest available firmware. This didn't fix the problem either. I am not using encryption. The only custom settings I'm using is a MAC filter for router access and static DHCP. So the problem remains that a direct-wired client can access port 25, yet wireless clients are blocked. I'll probably have to replace the router, which admittedly is older, but this is a problem I'd love to solve. Any ideas?
What happens if you connect one of the wireless machines with an ethernet cable? Any chance you have a Firewall of AV program blocking port 25 on these machines? Have you tried Safe Mode With Networking? I'm sure you realize that is most often caused by the ISP blocking Port 25, but I assume they would have told you so if this was the case.
NOTE: The image may vary depending on the computer and modem you're using.
Connecting the Devices Together
After confirming the Internet connection through the modem, connect
the modem to the Internet port of the router; connect the computer to
any of the four Ethernet ports at the back of the router. For
instructions, click here.
Checking the Router's LEDs
After connecting the devices together, check the lights on the front
panel of the router. Ensure that the Internet light, as well as
numbered light corresponding to the Ethernet port where the computer is
connected, is lit. For further instructions, click here.
Setting Up a Linksys Router for Cable Internet Connection
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: If you are using a Mac computer to access the router's web-based setup page, click here.
Step 2:
On the Setup tab, click the MAC Address Clone sub-tab.
Step 3:
Select Enabled then click Clone My PC's MAC.
Step 4:
Click Save Settings.
Step 5:
Click the Status tab.
Step 6:
Check the Internet IP Address. If the Internet IP Address has
numbers, this means the router has been properly configured. You
should now be able to access the Internet. If you're still unable to
access the Internet, powercycle the modem, the router and then restart
the computer.
NOTE: If the IP address is still 0.0.0.0, click IP Address Release then, click IP Address Renew. If this does not change the IP Address, powercycle the modem, the router and then restart the computer.
NOTE: The image may vary depending on the computer and modem you're using.
Once an active Internet connection is established through the modem,
connect the modem and the computer to the router by following the
instructions below.
Connecting the Devices Together
After ensuring that you have an active Internet connection, connect
the modem to the router's Internet port and the computer to any of the
four Ethernet ports. For instructions, click here.
After connecting the devices, check the LEDs by following the instructions below.
Checking the Router's LEDs
The Linksys router's front panel will indicate the status of the
connection. After connecting the broadband modem to the WAN or Internet
port, the computer to an available numbered port and powering on the
router check the lights on the front panel of the router. For
instructions, click here.
After checking the router's LEDs, configure the router for cable Internet. For instructions, follow the steps below.
Configuring a Linksys Router for a Cable Connection
For Telstra Cable
internet users, please contact Telstra to confirm if your internet
connection is using DHCP or HB (Heart Beat) signal. There should be no
other machine running HB client upon doing this procedure.
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: If you are using Mac to access the router's web-based setup page, click here. If you forgot your IP address, click here. If you forgot your router's password, click here.
Step 2:
When the router's web-based setup page appears, click the drop-down arrow under the Internet Connection Type field and select Automatic Configuration - DHCP.
(a) If you are NOT using Telstra HB, proceed with DHCP setup.
NOTE: If you are a Telstra Cable internet user and you're using WRT120N, WRT160N v1, WRT320N or WRT610N, please select Telstra Cable.
(b) If you are using Telstra Cable,
proceed with the following setup. Obtain your user name and password
from Telstra. Please disable any HB client that might have been
previously running on the PC after the router is configured.
Step 3:
Click 
.
Step 4:
Click MAC Address Clone.
Step 5:
Select Enabled and click Clone My PC's MAC.
Step 6:
Click 
.
Step 7:
Click Status. Check the value of the Internet IP Address. If the Internet IP Address
has numbers, this means the router has been properly configured. You
should now be able to access the Internet. If you're not online, perform
a power cycle to synchronize the router with the modem. For
instructions, click here.
NOTE: If the Internet IP Address is all zeroes (0.0.0.0) click 
first then click 
. If the Internet IP Address is still all zeroes (0.0.0.0) perform a power cycle. For instructions, click here.
If the IP Address starts with 192.168.1.xxx
or if it has the same first three numbers (octets) as the router's IP
address, change the router's LAN IP address to a different LAN segment.
For instructions, click here.
Once the router is configured, perform a power cycle. For instructions, follow the steps below.
Power Cycling
Step 1:
Shutdown the computer.
Step 2:
Unplug the router's power cable.
Step 3:
Unplug the Broadband modem's power cable and wait for 30 seconds.
Step 4:
Plug in the Broadband modem's power cable and wait for its lights to appear stable.
Step 5:
Plug in the router's power cable once the modem's lights appear stable.
Step 6:
Power on the computer on and test the Internet connection.
NOTE: If you're not online after performing this procedure, you may need to upgrade the firmware of the router.
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I immediately thought that the ISP was at fault, and tried to work through the problem with them first. I turned off the Firewall (ZoneAlarm) and AV prog (AVG) and this didn't help either.
The confusing thing is that the three computers always worked until a week ago, when they all stopped accessing port 25 simultaneously. This brings the ISP under immediate suspicion, but they insist that they are not blocking the port, and the computer connected to the Ethernet port kind of supports their claim.
I thought about trying one of the computers with a built-in NIC on a direct port to see what happens, although I'm pretty sure it will work if I do this. I will try safe-mode networking, but everything seems to point to the router, rather than an individual machine.
D-link doesn't support this model anymore, so I guess I have to cough up the money to buy a new router, which definitely won't be a D-link.
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