Answers: <p>For me it looks to be tunnel misconfigured -  "there is a message about protocol mismatch"</p>
  
  <p>Regarding the limitations quick google took me here: <a href="https://lists.strongswan.org/pipermail/users/2010-December/001179.html" rel="nofollow noreferrer">[strongSwan] strongswan limits</a></p>
  
Answers: CC BY-SA 4.0
Answers: 2020-02-07T13:04:05.570Z
Answers: 2020-02-07T13:04:05.570Z
Answers: patrykk
Body: <p>Consider the following situation (for test purposes):</p>
  
  <ul>
  <li>there is a public IPSec VPN endpoint (StrongSwan);</li>
  <li>a machine with either Ubuntu (Strong Swan client) or Windows OS (native client) running in the cloud should be the VPN guest.</li>
  </ul>
  
  <p>Result:</p>
  
  <ul>
  <li>Windows Server 2019 machine establishes VPN connection successfully but can't send any packet</li>
  <li>Ubuntu 18 machine establishes connection to some degree but does not create PPP0 interface.</li>
  <li>Ubuntu 16 machine makes a handshake but then there is a message about protocol mismatch (maybe in this specific case there is an incompatibility between both endpoints).</li>
  </ul>
  
  <p>Are there any AWS limitations to IPSec VPN?</p>
  
Tags: <amazon-web-services><devsecops><vpn>
Title: Is there a limitation in AWS to open an IPSec VPN connection?
UserDisplayName: Ta Mu
ThreadText: # Is there a limitation in AWS to open an IPSec VPN connection?
  
  (Asked by: username_0 on 2020-02-06)
  
  Consider the following situation (for test purposes):
  
  * there is a public IPSec VPN endpoint (StrongSwan);
  * a machine with either Ubuntu (Strong Swan client) or Windows OS (native client) running in the cloud should be the VPN guest.
  
  Result:
  
  * Windows Server 2019 machine establishes VPN connection successfully but can't send any packet
  * Ubuntu 18 machine establishes connection to some degree but does not create PPP0 interface.
  * Ubuntu 16 machine makes a handshake but then there is a message about protocol mismatch (maybe in this specific case there is an incompatibility between both endpoints).
  
  Are there any AWS limitations to IPSec VPN?
  
  **Tags:** amazon-web-services, devsecops, vpn
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2020-02-07. Score: 1
  
  For me it looks to be tunnel misconfigured - "there is a message about protocol mismatch"
  
  Regarding the limitations quick google took me here: [[strongSwan] strongswan limits](https://lists.strongswan.org/pipermail/users/2010-December/001179.html)
  
  
  ---
  
  