Sonicwall GVC VPN: Unable to connect to VPN. Error: “Packet length mismatch with interface MTU”

I had a client who was unable to connect to the Sonicwall VPN via GVC (Global VPN Client). Packet capture showed initial inbound traffic to the Sonicwall from Client is being dropped. Logs as below: 50 03/30/2016 14:16:06.912 X4*(i) -- VPN.CLIENT.IP.HERE SONICWALL.WAN.IP.HERE IP UDP 500,500 DROPPED 60[60] 51 03/30/2016 14:16:06.912 X4*(i) -- VPN.CLIENT.IP.HERE SONICWALL.WAN.IP.HERE IP … Continue reading Sonicwall GVC VPN: Unable to connect to VPN. Error: “Packet length mismatch with interface MTU”

Sonicwall Global VPN Client: Sonicwall GVC unable to connect through certain ISPs

In some cases, Sonicwall GVC is unable to connect to select ISPs/Networks, where it is proven working elsewhere (3G Tethering or other ISPs). Usual troubleshooting and things to look at is if VPN IPSec Passthrough is enabled on the home modem or router. There is another troubleshooting step that is worth trying, which is to … Continue reading Sonicwall Global VPN Client: Sonicwall GVC unable to connect through certain ISPs

Petya, NotPetya Security Recommendations

Prevention To proactively prevent from being attacked by this Petya-family of malware or mitigate the damage: Keep your computer with the latest patch, especially apply Microsoft Windows security update MS17-010. Enable the Windows Firewall to block incoming requests to ports 135, 139, and 445. Disable SMBv1 in Windows https://support.microsoft.com/en-us/help/2696547/how-to-enable-and-disable-smbv1-smbv2-and-smbv3-in-windows-and-windows. Segment your network into multiple network … Continue reading Petya, NotPetya Security Recommendations

#WCry Wannacry Security Recommendations

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