FRITZ!Box 3390 – Service - Knowledge Base

FRITZ!Box 3390 – Service

FRITZ!Box's wireless network cannot be found

A notebook, smartphone, tablet, or another wireless device cannot find the FRITZ!Box's wireless network (WiFi). When it searches for wireless networks, it does not display the name of the FRITZ!Box's wireless network (SSID).

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

Simply proceed as described below. After each measure, check whether the problem persists.

1 Enabling the wireless network

The following step is only necessary if the "WLAN" LED on the FRITZ!Box is not lit:

  • Briefly push the "WLAN" button on the FRITZ!Box to enable the wireless network.
    • or, if you enabled keylock in the FRITZ!Box,
      1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
      2. Click "Radio Network" in the "Wireless" ("WLAN") menu.
      3. Enable the wireless network.
      4. Click "Apply" to save the settings.

2 Enabling the wireless network adapter

Some notebooks have a special switch or a key combination that can be used to switch integrated wireless network adapters on and off:

  • Enable the wireless adapter of the wireless device that you want to connect to the FRITZ!Box's wireless network.

    Note:Refer to the manufacturer of the device for information on enabling it, for example consult the manual.

3 Adjusting the FRITZ!Box's wireless settings

Preparations

  • Use a network cable to connect a computer to the "LAN 2" port on the FRITZ!Box so you can open the user interface and adjust the wireless settings.

Enabling the 2.4 and 5 GHz frequency bands

Many wireless devices only support wireless connections in the 2.4 GHz frequency band. To ensure that the wireless device can establish a connection to the FRITZ!Box, enable the 2.4 GHz and 5 GHz frequency band in the FRITZ!Box:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Network" in the "Wireless" ("WLAN") menu.
  3. Enable the wireless network for the 2.4 and 5 GHz frequency band. If the option "Wireless radio network enabled" is only displayed once, enable the Advanced View first.
  4. Click "Apply" to save the settings.

Displaying the name of the wireless network (SSID)

Some wireless devices cannot establish a wireless connection if the name of the wireless network is not visible:

Note:Hiding the wireless network name can pose a security risk (see article in PC World: 5 Wi-Fi security myths you must abandon now).

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Network" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Name of the wireless radio network visible". If the option is not displayed, enable the Advanced View first.
  4. Click "Apply" to save the settings.

Changing the name of the wireless network (SSID)

Some wireless devices cannot establish a wireless connection if the name of the wireless network contains special characters:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Network" in the "Wireless" ("WLAN") menu.
  3. In the fields "Name of the wireless radio network (SSID)", enter a unique name for the 2.4 GHz and the 5 GHz frequency band without special characters. If only one field is displayed, enable the Advanced View first. Since not every wireless device support all special characters, we recommend using only standard alphanumeric characters and not symbols or special letters such as ä, ë, ö, ü, á, é, í.
  4. Click "Apply" to save the settings.

Automatically configuring wireless channel settings

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Channel" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Set radio channel settings automatically (recommended)".
  4. Click "Apply" to save the settings.

Adjusting wireless channels in the 2.4 GHz frequency band

Some wireless devices do not support channels 12 and 13 in the 2.4 GHz frequency range:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Channel" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Adjust radio channel settings".
  4. Select "Auto channel" from the drop-down list "Radio channel in 2.4-GHz frequency band".
  5. Click "Additional settings".
  6. Disable the option "Wireless auto channel including channel 12/13 (2.4 GHz frequency band)".
  7. Click "Apply" to save the settings.

Adjusting wireless channels in the 5 GHz frequency band

Some wireless devices do not support the channels 52 to 140 in the 5 GHz frequency range:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Channel" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Adjust radio channel settings".
  4. Select a channel between 36 and 48 from the drop-down list "Radio channel in 5-GHz frequency band".
  5. Click "Apply" to save the settings.

4 Installing the latest FRITZ!OS for the FRITZ!Box

Perform the following steps on a different device connected to the FRITZ!Box:

5 Installing the latest software for the wireless device

  • Install the latest driver for your computer's wireless network adapter or the latest operating system (for example Android, iOS) for the wireless device.

    Note:Refer to the manufacturer for information on updating the wireless network adapter or wireless device, for example consult the manual.
    You can find the latest drivers for the FRITZ!WLAN Sticks in our download area.

6 Finding the ideal location for the FRITZ!Box

  1. If possible, position the FRITZ!Box in a central location.
  2. Do not position the FRITZ!Box directly in the corner of a room.
  3. Position the FRITZ!Box so that it is as unobstructed as possible, i.e. not directly in back of or under an obstacle such as pieces of furniture or a heater.
  4. Position the FRITZ!Box as high in the room as possible, for example on a shelf.
  5. Position the FRITZ!Box so that there are as few obstacles as possible between it and other wireless devices. Especially metallic objects or objects containing water, for example radiators, refrigerators, or even houseplants, significantly reduce the quality of the wireless signal.
  6. Position the FRITZ!Box so that it is away from other radio transmitters, for example microwaves, wireless speakers, or Bluetooth devices.

7 Testing a different wireless device

  • Test whether a different wireless device can find the FRITZ!Box's wireless network.
    • If the other wireless device can find the FRITZ!Box's wireless network, then the first wireless device may be defective.