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Description:

This master document contains helpful articles on Troubleshooting on various issues.

Traces are very important in order to analyze a malfunction or a failure. Therefore the following articles have been arranged according to the necessity or possibility of trace recording.

Troubleshooting guides with recording traces:

Articles regarding general topics

Title
Troubleshooting guide: xDSL connection cannot be established or terminates
Troubleshooting guide: Port forwarding not working
Troubleshooting guide: WAN connection troubleshooting
Troubleshooting Guide: The Content Filter does not function correctly
Troubleshooting guide: (Remote) troubleshooting of UMTS/3G and LTE/4G connections

Articles regarding VPN connections

Title
Troubleshooting guide: An additional local network cannot be accessed via VPN
Troubleshooting guide: VPN connection between two routers cannot be established or terminates


Articles regarding the Advanced VPN Client

Title
Troubleshooting guide: Error message "Automatic media detection – could not find suitable media to establish a connection" in the Advanced VPN Client

Articles regarding WiFi

Title
Troubleshooting guide: An access point cannot obtain a WLAN profile from the WLAN-Controller
Troubleshooting guide: No access to the Public Spot login page
Troubleshooting guide: Analyzing connection problems when operating AutoWDS
Troubleshooting guide: A device attempting to authenticate in the Wi-Fi is rejected or the device loses the Wi-Fi connection (LCOS LX)
Troubleshooting guide: A device attempting to authenticate in the Wi-Fi is rejected or the device loses the Wi-Fi connection (LCOS)


Articles regarding VoIP

Title
Explaining VoIP trace: Inbound phone call on a single account with an ISDN subscriber
Explaining VoIP trace: Outbound phone call on a single account with an ISDN subscriber
Explaining VoIP trace: Inbound phone call on a SIP trunk with an ISDN subscriber
Explaining VoIP trace: Outbound phone call on a SIP trunk with an ISDN subscriber
Troubleshooting guide: Error analysis in VoIP scenarios

Articles regarding the LANCOM Management Cloud

Title
Troubleshooting Guide: Procedure in case of inaccessibility of a unit operated with LCOS in the LMC
Troubleshooting guide: Firmware update of a LANCOM device via the LANCOM Management Cloud fails
Troubleshooting Guide: How to proceed when a device operated LCOS SX cannot be accessed in the LMC


Troubleshooting guides without recording traces:

Articles regarding general topics

Title
Firmware upload failure and / or router not accessible anymore
Troubleshooting guide: RADIUS authentication not possible due to missing EAP/TLS certificate
Troubleshooting guide: Configuration in LANconfig cannot be written back to the device due to an SNMP error
What does the error message "PAP NAK received" mean?
Troubleshooting guide: Configuration synchronization doesn't work anymore (Config Sync)

Articles regarding the Advanced VPN Client

Title
Troubleshooting guide: Data transmission with the Advanced VPN Client is slow
Troubleshooting guide: The connection established with my LANCOM Advanced VPN Client doesn't work
Troubleshooting guide: Cannot establish AVC connection created with LANconfig 10.80 Rel
Troubleshooting guide: Error message "Open logfile failed" on the Advanced VPN Client under macOS X
Troubleshooting Guide: After importing a VPN profile file, the LANCOM Advanced VPN Client V3.0 does not connect


Articles regarding WiFi

Title
Troubleshooting guide: iPhone and iPad do not login to the LANCOM RADIUS server using the MD5 signature algorithm
Troubleshooting guide: Error message 'AP configuration error 18' in LANmonitor in a WLAN controller scenario
Troubleshooting guide: In a WLC scenario, changing the WPA2/3 session key types on access points with certain 802.11ac WLAN modules stops an SSID from being broadcast

Articles regarding Wireless ePaper

Title
LANCOM Wireless ePaper Server: Disable regular SSH login attempts to a LANCOM ePaper access point
Troubleshooting Guide: Error message "Network-Status: Outbound-Rejected" in the ePaper status table on an ePaper access point (as of LCOS 10.40)
LANCOM Wireless ePaper: What information does LANCOM Support require to process a support case?
LANCOM Wireless ePaper: What do I do if the access point is displayed alternately as "connected" and "not connected"?
LANCOM Wireless ePaper: How to stop the batteries in ePaper Displays from discharging too quickly

Articles regarding VoIP

Title
Troubleshooting guide: A configured SIP line cannot register with the provider
Troubleshooting: After updating to LCOS 10.42, problems with telephony occur when using a SIP PBX
Troubleshooting guide: Outgoing data connection of an ISDN subcriber (Clearmode) via a SIP line doesn't work

Articles regarding the LANCOM Management Cloud

Title
Troubleshooting guide: LANconfig cannot be used to pair a LANCOM R88x device with the LMC
Troubleshooting guide: A device configuration in the LMC cannot be rolled out to the device due to an SNMP error


Article regarding LANCOM R&S®Unified Firewalls

Title
Troubleshooting guide: Search results from Bing cannot be called up via a LANCOM R&S®Unified Firewall with active SafeSearch
Troubleshooting: A failed update from LCOS FX 10.4.3 to LCOS FX 10.5.x
Troubleshooting guide: LANCOM R&S®Unified Firewall cannot communicate with a device over an IKEv2 connection
Troubleshooting Guide: Webpage views not possible with active antivirus on LANCOM R&S®Unified Firewalls after 01.10.2023
Troubleshooting guide: An application on a device in a LANCOM R&S®Unified Firewall network cannot communicate with the Internet

Article regarding LANCOM Switches

Title5
Troubleshooting guide: GS-3xxx switch deactivates PoE when external voltage is detected on a PoE port 
Troubleshooting Guide: High CPU load during SNMP monitoring on a GS-3xxx series switch due to erroneous VLAN settings 

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