Paralles Windows Client cannot connect out of HTML5 Portal

Discussion in 'Parallels Remote Application Server – HTML5 Gateway' started by JuergenS11, Mar 14, 2020.

  1. JuergenS11

    JuergenS11 Bit Poster

    Hi All,
    I have published HTML5 Portal to the internet via Sophos WAF. HTML5 connection within a browser is working fine. When I try to start the windows client out of HTML5 portal I get a connection error.

    Is there something special I have to take care of?

    Regards, Juergen
  2. Eugene. K.

    Eugene. K. Parallels Team

    When you launch the Windows client from the HTML5 portal do you get the Windows client actually started? The connection error happening in your case appears in the windows client, right? Please show us the error.
    HTML5 client gives Windows Client instructions on where to connect to (basically RAS connection settings) then RAS Connection is established and RDP connection to RAS Gateway is started.
    As you can see there are several communications involved in getting your app on your desktop. but normally all these communications are executed via port 443 on RAS Gateway. I doubt 443 is prohibited on your firewall unless it decrypts traffic in the middle and RAS gets HTTP traffic on 443 while waiting for HTTPS.
  3. JuergenS11

    JuergenS11 Bit Poster

    Dear Eugene,
    thanks for your answer. Please xcute the extremly delayed answer. But as of corona the customer hat different priorities. However I need to follow up as we have to extend parallels ressources in order to provide more power, flexibility and convinience for home office work.

    The windows client is comming up. After delay of approx. 1min it shows error "Code [02/00000006]. I can't see errors in Firewall log.

    Please be aware that HTML5 client is working properly.

    Some words to our configuration. Parallels RAS gateway is published through a Sophos UTM Firewall with WAF functionality (no port forwarding).

    What is best practice how to poblish RAS Gateway?
    - placing the server direct in the internet
    - RAS gateway in a DMZ behind a firewall with port forwarding HTTPS 443
    - WAF publishing?

    Is it possible to buy some support hours in order to fix the problem and discuss some concerns?

    Kind Regards, Juergen

    Attached Files:

  4. Eugene. K.

    Eugene. K. Parallels Team

    Dear Juergen,
    if you have a subscription license you have an ability to contact support at any moment with no real limit. Please log in to and open a support ticket. if you don't have a subscription then you should talk to sales:

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