Problem: Client behind NAT devices are unable to connect to VPN L2TP Solution: Modern Windows devices do not support L2TP/IPsec connections when the Windows computer or VPN server are located behind a NAT. If the Windows VPN client fails with Error 809 when trying to establish a VPN connection to an MX located behind a … Continue reading TSHOOT: VPN L2TP not working on some Windows machines
Most modern web browser no longer support RC4 encrytion as it is officially declared unsecured by IETF memo RFC7465 published on February 2015. (See Workaround below to find an older browser to get around this error) Thus if RC4-Only encryption is enabled in SonicOS, it would block access to the Firewall Management Portal and will display "err_ssl_version_or_cipher_mismatch" error … Continue reading Tricks: Unable to access Sonicwall Management Portal? ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Sweep Ping. If you want to check all the devices on the LAN Network by doing a sweeping ping to all the IPs in a given /2 subnet. for /L %a in (1,1,254) do @ping -n 1 192.168.1.%a|find "TTL" Just replace the 192.168.1 with your first three octets. 2. DIsplay your machines Routing Table using … Continue reading Tricks: 6 handy and simple tools in Network troubleshooting
Problem: Error when connecting to VPN Error Message: Reason 442: Failed to enable Virtual Adapter If you receive this error on Windows 8.1 or Windows 10 while trying to connect with the Cisco VPN Client then the solution is a simple registry fix. To fix: Click Start and type regedit in the Search field and hit enter. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA Find the String … Continue reading Tricks: Cisco VPN on Windows 8.1 or Windows 10 – Reason 442: Failed to enable Virtual Adapter
In a blog statement released by Microsoft on the 28th of June, Microsoft released a Windows 10 Insider Preview Build 16232 and Windows 10 Mobile Insider Preview Build 15228 to Insiders in the Fast ring which is part of the new end-to-end security features in Windows 10. This is to tackle the serious issue of a … Continue reading Microsoft Windows 10 to introduce protection “switch” against Ransomwares
Problem: Legacy Cisco VPN Client (v5.0.07)is not working on Windows 10. Version 5.0.07 is the last version of this client application released by Cisco until they introduced Cisco AnyConnect as their new VPN Client Software. Workaround: Steps below: Step-by-step guide 1. Download and install the Sonicwall 64-bit VPN client from HERE (as of this writing). **NOTE: Make … Continue reading Tricks: How to make Legacy Cisco VPN Client to work on Windows 10?
Outbreak Date: 13 May 2017 - (Ransomware) WannaCry I know its bit old, and (almost?) quiet (perhaps, evolving) after the "kill switch" was triggered up. But here are my compiled Security Recommendations from various Firewall Vendors on mitigating the risks and protecting your network from the threats brought about by this ransomware known as WannaCry. Yesterday, another … Continue reading #WCry Wannacry Security Recommendations