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Old 18 Feb 2019, 11:08 PM   #1
thymara
Member
 
Join Date: Sep 2012
Posts: 97
Chaikin Remote Images don't load

This image address — https://www.fastmailusercontent.com/...OI1AwIQXFiOBrg

returns this message — E: remote returned 500 Internal Response: Cannot create SSL connection: SSL connect attempt failed error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure

I have tried this in 3 browsers — Safari, Chrome, Firefox — and use always load remote content.

Other e-mail apps such as Mail and ZOHO ( app or browser version) do not have this problem
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Old 19 Feb 2019, 04:59 AM   #2
n5bb
Intergalactic Postmaster
 
Join Date: May 2004
Location: Irving, Texas
Posts: 8,473
Arrow External content security issues

The link you sent (to a secure www.fastmailusercontent.com URL) is not intended for anyone but you. In general, you should not post such internal Fastmail related temporary URL’s, since they could theoretically expose your account to attacks. In this case, Fastmail uses authentication cookies on your browser and that is a temporary URL which will only be valid for around 24 hours. You will need to file a support request with Fastmail - nobody reading this here can assist you with Fastmail internal error messages such as this.

Here is why I think you might be seeing this message:
  • When an email system sends you an image inside an email which needs to be shown when the message is rendered in your browser, they can either embed that image inside the email itself or embed a link to a copy of that image on some server.
  • With most email providers (but not Fastmail), if the link is embedded in the message so that the image is retrieved from an external server, the service that sent you the email can determine both the exact time that you are viewing their message and the IP address of the computer you are using (since the image is directly loaded from that external server into your browser). See:
    https://www.fastmail.com/help/receiv...tecontent.html
  • As described in Fastmail Help at the link I just gave, Fastmail does not load such external images by default. If you choose to allow one or all external images to be loaded, they are loaded into a www.fastmailusercontent.com URL, then you are shown the image served from www.fastmailusercontent.com at a Fastmail-managed page rather than the original server specified by the sender. Fastmail uses cookies to authenticate the request from your browser to their internal www.fastmailusercontent.com server.
  • The additional server setup from Fastmail is used any time that potentially dangerous content needs to be shown to the user. The sending system knows that you opened their message for reading, but they don’t know the IP address of your PC.
  • In your case, I think that the external content is at a secure (https://...) server URL, but Fastmail can’t successfully negotiate a secure connection. This is between Fastmail and the external site, so your choice of browser would have no effect. It might be due to problems with the encryption supported at each end. See:
    https://www.fastmail.com/help/techni...sstarttls.html
  • So my suggestion is for you to file a Fastmail support request with as many details as possible at:
    https://www.fastmail.com/support/
Bill
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