For quite some time now, we have been experiencing an issue with the Cisco VPN client that will make the client completely unusable. I have noticed that when a specific feature of Symantec Endpoint Protection is enabled, it will (about 25% of the time) cause the following errors to appear when attempting to connect anywhere with the Cisco VPN client. Once this error happens once, the VPN client then becomes useless.
Reason 414: Failed to establish a TCP connection
Reason 440: Driver Failure
Reason 442: Failed to enable virtual adapter
It seems that fixing one error will cause the other error to come up...
I have tried reinstalling the client with the same version and older versions and the issue still comes up.
All users in the company are using Windows 7 64-bit with SP1 installed.
The oddest thing about this is that all employees in the company have the same antivirus with the same features enabled, however, it only happens to a small percentage of employees.
Please let me know if you have any suggestions and thanks in advance!
Are the all the systems using the same firewall policy. It could be one of the rules configured in the SEP client. What build version are you running? Are all systems using the same version of VPN client? As Parminder stated, you should disable the firewall and check behavior.
If the firewall is found to be the cause, you can troubleshoot by adding an "Allow All" rule to the top of the SEP policy. Moving the rule down one line at a time until the problem occurs again. Once that happens, you will have narrowed it down to the rule just above.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...