[RndTbl] strange IMAP / G3 problem

[Theodore Baschak]

Not that I'd expect this to be the underlying cause, but have you tried
with a valid cert? https://letsencrypt.org/ makes this free for those
dabble in TLS without spending a fortune.


Theodore Baschak
https://ciscodude.net/
https://theodorebaschak.com/

On Mon, Mar 7, 2016 at 12:30 PM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> Brad & I are having a weird problem with his iphone 4S (with the latest
> iOS versions).
>
> iphone builtin mail
> imaps (port 993)
> ssl (self-signed) (old ciphers disabled on server)
> dovecot
>
> He can connect to imap with the above config on his in-office wifi,
> in-home wifi over vpn to office, and shaw open wifi outside his
> office/home network.
>
> If he switches to 3G (I don't think his phone does LTE) then suddenly he
> can't connect!  (With some useless "can't connect" error.)
>
> Huh?  Duh?
>
> Exact same setup and settings on an iphone 5 works fine.  Also works fine
> on Android.  The problem is just on his 4S.
>
> Even more interesting, if he wifi tethers a PC to his 4S over 3G and hits
> imaps using thunderbird on the PC it works fine.
>
> My question is, what on earth does changing the connection layer have
> anything to do with this?  Can the phone be doing something differently in
> the mail app depending on 3G or wifi???  Can the 3G network be blocking
> something (unlikely since the tethered PC works)?  It make no sense
> whatsoever to me.  Maybe his phone is p0wned?  I'm stumped.  Ideas?
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