User`s guide

Chapter 17 Troubleshooting
NWA5120 Series User’s Guide
173
1 Make sure the wireless LAN (wireless radio) is enabled on the NWA.
2 Make sure the radio or at least one of the NWA’s radios is operating in AP mode.
3 Make sure the wireless adapter (installed on your computer) is working properly.
4 Make sure the wireless adapter (installed on your computer) is IEEE 802.11 compatible and
supports the same wireless standard as the NWA’s active radio.
5 Make sure your computer (with a wireless adapter installed) is within the transmission range of the
NWA.
6 Check that both the NWA and your computer are using the same wireless and wireless security
settings.
Hackers have accessed my WEP-encrypted wireless LAN.
WEP is extremely insecure. Its encryption can be broken by an attacker, using widely-available
software. It is strongly recommended that you use a more effective security mechanism. Use the
strongest security mechanism that all the wireless devices in your network support. WPA2 or WPA2-
PSK is recommended.
The wireless security is not following the re-authentication timer setting I specified.
If a RADIUS server authenticates wireless stations, the re-authentication timer on the RADIUS
server has priority. Change the RADIUS server’s configuration if you need to use a different re-
authentication timer setting.
I cannot get a certificate to import into the NWA.
1 For My Certificates, you can import a certificate that matches a corresponding certification
request that was generated by the NWA. You can also import a certificate in PKCS#12 format,
including the certificate’s public and private keys.
2 You must remove any spaces from the certificate’s filename before you can import the certificate.
3 Any certificate that you want to import has to be in one of these file formats:
• Binary X.509: This is an ITU-T recommendation that defines the formats for X.509 certificates.
• PEM (Base-64) encoded X.509: This Privacy Enhanced Mail format uses lowercase letters,
uppercase letters and numerals to convert a binary X.509 certificate into a printable form.
• Binary PKCS#7: This is a standard that defines the general syntax for data (including digital
signatures) that may be encrypted. A PKCS #7 file is used to transfer a public key certificate. The
private key is not included. The NWA currently allows the importation of a PKS#7 file that
contains a single certificate.