https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801277#M1098997 <P>I have a problem with my FTDv 7.3.1 on ESXi. When I start uploading a large file over L2L VPN using SCP or SFTP between the server and the remote host, after a while the outside FTDv subinterface becomes unavailable and IPSec is aborted. After a few minutes, the subinterface becomes available. I tried it many times and always I got this problem.<BR />I tried restarting FTDv and the problem was fixed after that, but I don't know if it will come back again.<BR />What can I do to find the cause and fix it?</P> Sat, 25 Mar 2023 11:55:25 GMT dyakovsky 2023-03-25T11:55:25Z https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801277#M1098997 <P>I have a problem with my FTDv 7.3.1 on ESXi. When I start uploading a large file over L2L VPN using SCP or SFTP between the server and the remote host, after a while the outside FTDv subinterface becomes unavailable and IPSec is aborted. After a few minutes, the subinterface becomes available. I tried it many times and always I got this problem.<BR />I tried restarting FTDv and the problem was fixed after that, but I don't know if it will come back again.<BR />What can I do to find the cause and fix it?</P> Sat, 25 Mar 2023 11:55:25 GMT https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801277#M1098997 dyakovsky 2023-03-25T11:55:25Z https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801302#M1098998 <P>are you use any IP SLA ??<BR />the icmp can drop before interface congestion and this make the interface UP/DOWN&nbsp;</P> Sat, 25 Mar 2023 13:45:31 GMT https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801302#M1098998 MHM Cisco World 2023-03-25T13:45:31Z https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801384#M1099001 <P>No, I didn't set up an IP SLA. I have another FTDv in the same version. And it doesn't have that problem.</P> Sat, 25 Mar 2023 19:42:13 GMT https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801384#M1099001 dyakovsky 2023-03-25T19:42:13Z https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801479#M1099005 <P>check if there is any fragment that lead to high CPU utilize and this make some control packet drop and make the link flapping&nbsp;</P> Sun, 26 Mar 2023 11:27:01 GMT https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801479#M1099005 MHM Cisco World 2023-03-26T11:27:01Z https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801529#M1099007 <P>Thanks for advice. Right now FTD is working well, I can't reproduce this issue, but I'll keep an eye on it.</P> Sun, 26 Mar 2023 16:06:50 GMT https://community.cisco.com/t5/network-security/ftdv-outside-interface-problem/m-p/4801529#M1099007 dyakovsky 2023-03-26T16:06:50Z