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    • ATP800 - SSL VPN is slow

    Posts: 3  Freshman Member
    Friend Collector Third Anniversary
    in Security
    Hey everyone,

    I did the setup of a SSL VPN on our new ATP800 (setup was super fast and straightforward). The problem we're facing now is that we suffer from a really slow speed through the VPN.

    We have a 500D/100U Mbps on site.

    Through the VPN we barely have 600KB/s.

    I tried to look on the net to search for a magic option hidden somewhere but didn't  really find anything yet.

    I thank you all in advance.

    Best regards,

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    Accepted Solution

    • Posts: 1,034  Zyxel Employee
      50 Answers 500 Comments Friend Collector Fourth Anniversary
      edited June 2021 Answer ✓
      @Antoine_Richez

      As current design, SSL VPN will have an disadvantage(in compare with L2TP) when it comes to throughput. It could be limited to 10-20Mbps. 

      Also, RDP uses a lot of it's bandwidth for screen data and instruction transfer. It's not exactly designed as a file transfer protocol. 

      To get the better performance, you could establish the L2TP with FTP download or use teamviewer as remote tool for downloading.

    All Replies

    • Posts: 1,034  Zyxel Employee
      50 Answers 500 Comments Friend Collector Fourth Anniversary
      @Antoine_Richez
      Can I know what is the way you got the VPN performance, SMB, FTP or Http?
      I would like to establish the SSL VPN from my side, therefore can you private message the remote information to me?
    • Posts: 3  Freshman Member
      Friend Collector Third Anniversary
      @Zyxel_Charlie
      I've sent you a message with the corresponding informations.

      Have a nice day.
    • Posts: 1,034  Zyxel Employee
      50 Answers 500 Comments Friend Collector Fourth Anniversary
      @Antoine_Richez
      Thanks for your information.
      If possible, I would like to know the RDP information of this scenario for check further.

    • Posts: 109  Ally Member
      Zyxel Certified Network Engineer Level 1 - Security First Comment Friend Collector Sixth Anniversary
      Did you get an solution? Please keep us also up to date.
      I think it's a generic problem, the speed of the SSL VPN is bad.
      See in the Ideas section, and please upvote the Wirequrard request.
      Mario

    • Posts: 1,034  Zyxel Employee
      50 Answers 500 Comments Friend Collector Fourth Anniversary
      edited June 2021 Answer ✓
      @Antoine_Richez

      As current design, SSL VPN will have an disadvantage(in compare with L2TP) when it comes to throughput. It could be limited to 10-20Mbps. 

      Also, RDP uses a lot of it's bandwidth for screen data and instruction transfer. It's not exactly designed as a file transfer protocol. 

      To get the better performance, you could establish the L2TP with FTP download or use teamviewer as remote tool for downloading.

    • Posts: 109  Ally Member
      Zyxel Certified Network Engineer Level 1 - Security First Comment Friend Collector Sixth Anniversary
      >As current design, SSL VPN will have an disadvantage(in compare with L2TP) when it comes to >throughput. It could be limited to 10-20Mbp
      Is it on the roadmap to fix this design issue?
      Openvpn or Wireguadr are known solutions to solve such problems ;)




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