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• The problem is caused by a security update of Windows 8.1. By now,Microsoft released a fixed update. Please connect your computer to theInternet, choose Start→ Control Panel → WindowsUpdate and install all available updates. After a Windows restartyour AnyConnect connection should work properly again. If you needsupport, please contact IT-Servicedesk ofHRZ.

• The Internet Connection Sharing (ICS) is enabled. In thiscase AnyConnect is on principal not trying to establish aconnection.
  Change the properties of thenetworkconnection thatconnects you totheinternet and disable the ICS asfollowing:
  Choose Start → Control Panel → Network and Internet → Changeadapter settings → Right-click on theshared network connection and choose Properties →Sharing tab. Then deactivate thecheckbox 'Allow other network users to connect through thiscomputer's Internet connection'. After that, confirm the dialogvia OK.
  

• If you are using the Kaspersky AV firewall you need to addAnyConnect as a firewall exception. It might be more useful to use thefree anti-virussoftware provided by the HRZ.
• The Internet Connection Sharing (ICS) is enabled. In thiscase AnyConnect is on principal not trying to establish aconnection.
  Change the properties of thenetworkconnection thatconnects you totheinternet and disable the ICS asfollowing:
  Choose Start → Control Panel → Network and Internet → Changeadapter settings → Right-click on theshared network connection and choose Properties →Sharing tab. Then deactivate thecheckbox 'Allow other network users to connect through thiscomputer's Internet connection'. After that, confirm the dialogvia OK.
• You have encountered a software bug in AnyConnect. If you find avalue like '@oem20.inf,%vpnva_Desc%;Cisco AnyConnect VPNVirtual Miniport Adapter for Windows x64' for the registry key'ComputerHKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesvpnvaDispayName'in the Windows registry (regedit.exe), please delete all charactersbefore the word 'Cisco' in the value. After that, close theregistry editor, start AnyConnect and try to connect again.

• The AnyConnect VPN service does not start automatically. Theerror message 'VPN Service not available. The VPN agent service isnot responding. Please restart this application after a minute'means, that the Cisco AnyConnect VPN service currently is not running.This could be caused by a Windows boot accelerator software, thatmodifies the start order of the Windows services in a way, someservices cannot be started anymore. In the past such problems werecaused by e.g. Lenovo Rapid Boot(also: RapidBoot HDDAccelerator, RapidBoot Shield) and CCleaner. After uninstalling suchsoftwares, the problem should be solved (Windows XP:Control Panel →Add/RemovePrograms, Windows Vista/7/8:Control Panel → Programs andFeatures).

AnyConnect fails with the message 'Connection attempt failed.Please try again'.

• In AnyConnect the wrong VPN-Gateway was specified. Please enter theVPN-gateway vpn.uni-marburg.de and try to connect again.

• The computer's Internet connection does not work. Please make sureyour computer has a working Internet connection and try to connectagain.

• A firewall or internet security software fromComodo manages the connection and prevents CiscoAnyConnect from working properly. Choose Start → ControlPanel → Network and Internet → Change adapter settings →right-click on the Cisco Anyconnect SecureMobility Client and chooseProperties. In the list of supported items ofthe connection deactivate the checkboxComodo Internet Security Firewall Driver andconfirm the dialog via OK.

• An additional firewall, anti-virus or internet security softwareprevents the installation of AnyConnect. Please temporarily deactivatethis software and try the installation of AnyConnect again. If thisalso fails, please uninstall this software, restart your Windowscomputer and try the installation of AnyConnect again. If youuninstalled your anti-virus software, please install another anti-virussoftware, for example the free anti-virus-software for students andstaff of university.