[korganizer] [Bug 453121] calender can't connect to nextcloud

[m.eik michalke]

https://bugs.kde.org/show_bug.cgi?id=453121

--- Comment #18 from m.eik michalke <bugs.kde.org at ad.gelduntergang.biz> ---
(In reply to m.eik michalke from comment #17)
> turns out: using a custom port
> an the server behind a NAT router might be the real issue in my case. at
> first 'openssl' kept waiting for a response until i aborted the call. i then
> tried the '-4' switch to force using an IPv4 address, and that resulted in a
> successful connection. TLS connection war ok for both TLS v1.2 and v1.3.
> this led me to assume that, while web browsers, the seafile client and
> vdirsyncer seem to fall back to IPv4 (because of the explicitly set port?),
> akonadi might only be trying IPv6 and doesn't get a response because there's
> not NAT.

yes, that's really it. i called 'ping -4' on the server and temporarily added
it's current IPv4 address to /etc/hosts to resolve the domain locally, after
that kontact was *instantly* able to fetch contacts and calendars. so all i'm
missing is a way to tell kontact/akonadi to try IPv4 first.

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