Apr 11, 2012 I have two Dell Lattitude E6520 Windows 7 64 bit laptops with MS Office 2007 installed. They will not connect to the 2007 Exchange Server during a Cisco VPN sesion. During the VPN sesion all network drives are accessible, it is only MS Outlook that is not connecting. While inside the firewall both laptops connect to the Exchanger Server without. My Cisco Anyconnect VPN Client keeps on disconnecting after I changed my laptop and upgraded to windows 10. My internet connection is same and it was working fine on my previous laptop. In Device Manager under Network Adapter I see a warning sign on my Microsoft Wi-Fi Direct Virtual Adapter. Feb 18, 2015 -Cisco Anyconnect 3.1.04063 We use Outlook and lync 2013 for accessing Email and IM on these machines and we use Cisco Anyconnect for accessing our VPN when these people are out in the field. The Problem occurs when they go out in the field and access their VPN, use outlook and lync and everything else they would normally and then return to the.
Cisco Anyconnect Updates
TL;DR If Cisco AnyConnect is disconnecting, reconnecting every few minutes, try blocking UDP in/out ports for the vpnagent executable/service.Cisco AnyConnect Secure Mobility Client version 4.7.04056
This one drove me nuts for the longest time until I found time to dedicate to troubleshooting it myself. Symptoms were that my AnyConnect client had been disconnecting, reconnecting every few minutes (2:50 to be exact!), which would, in turn, timeout my RDP session. Total reconnect time was only a few seconds, but you can imagine how having your concentration broken every three minutes is a productivity killer!
I had troubleshot this with my ISP, Comcast/Xfinity and my customer (whose site I was connecting to via VPN). Both essentially were pointing fingers at each other. It would be easy to blame the ISP because the problem didn't happen over my hotspot, but I can't help but think that the VPN server wasn't configured to properly handle such situations. Anyway, I decided to live with it (for far too long) until I could do some troubleshooting myself and figure out next steps.
Cisco Anyconnect 4.9 Outlook Disconnected
My troubleshooting steps are below, in case anyone is interested.Install Cisco Anyconnect Vpn
Simplenote markdown. Wireshark | Wireshark VPN test-2019-12-09-A.pcapng Wireshark VPN test-2019-12-09-G-Comcast.pcapng Wireshark VPN test-2019-12-09-F-Hotspot.pcapng Wireshark VPN test-2019-12-09-E-Comcast-Reconnect at 129 sec.pcapng Wireshark VPN test-2019-12-09-D-Hotspot.pcapng Wireshark VPN test-2019-12-09-C-Comcast-Reconnect at 91 sec.pcapng Wireshark VPN test-2019-12-09-B.pcapng | Noticed that most application traffic happens via DTLS (OpenSSL) over UDP, but every 20 seconds, there's a TLSv1.2 transmission from the client [PSH, ACK], but no response from the server.Client retransmits the [PSH, ACK] in intervals of 0.3, 0.6, 1.2, 2.4, 4.8, 9.6 seconds, and then sends a RST. |
Google search | cisco vpn client tls every 20 seconds no ack | |
Article above references this, which was the most helpful | As long as DTLS is enabled, the client applies the DTLS MTU (in this case 1418) on the VPN adapter (which is enabled before the DTLS tunnel is established and is needed for routes/filters enforcement), to ensure optimum performance. If the DTLS tunnel cannot be established or it is dropped at some point, the client fails over to TLS and adjusts the MTU on the virtual adapter (VA) to the TLS MTU value (this requires a session level reconnect). | |
Block UDP (in & out) for VPN client in Windows Firewall | C:Program Files (x86)CiscoCisco AnyConnect Secure Mobility Clientvpnagent.exe |