Owner`s manual
Continued
77
C. Close all the windows to nish.
I can’t access my email, web, or VPN, or I am getting corrupted data from the Internet
The Maximum Transmission Unit (MTU) setting may need to be adjusted. By default,
the MTU is set at 1500. Most DSL users should use MTU 1492. If you are having some
difculties, perform the following steps:
A. To connect to the Cortexa, go to the Web-based Utility, as shown in “Section 6.2”.
B. Click the Advanced => Wan tab.
C. Look for the MTU option, and in the Size eld, enter 1492.
D. Click the Save button to continue.
If your difculties continue, change the Size to different values. Try this list of values, one
value at a time, in this order, until your problem is solved:
1462
1400
1362
1300
When I enter a URL or IP address, I get a time-out error or am prompted to retry
A. Check if other PCs work. If they do, ensure that your workstation’s IP settings
are correct (IP Address, Subnet Mask, Default Gateway, and DNS). Restart the
computer that is having a problem.
B. If the PCs are congured correctly, but still not working, check the Cortexa. Verify
that it is connected and ON. (If you cannot connect to it, check the LAN and power
connections.)
C. If the Cortexa is congured correctly, check your Internet connection (DSL/cable
modem, etc.) to see if it is working correctly. You can remove the Cortexa to verify
a direct connection.
D. Manually congure the TCP/IP with a DNS address provided by your ISP.
E. Make sure that your browser is set to connect directly and that any dial-
aPPendIx a