Bug 352434

Summary:	KRDC cannot handle IPv6 addresses via RDP
Product:	[Applications] krdc	Reporter:	Lubos Dolezel <lubos>
Component:	RDP	Assignee:	Urs Wolfer <uwolfer>
Status:	CONFIRMED ---
Severity:	normal	CC:	fell, liyqme+kde, paolo.pedroni, tomas.hanak
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Lubos Dolezel 2015-09-08 12:37:55 UTC

When I try using "rdesktop" directly, then the following works:

$ rdesktop fd00:1::30a2:6a30:2e19:d185

This works as well:

$ rdesktop [fd00:1::30a2:6a30:2e19:d185]

However, when I try connecting to [fd00:1::30a2:6a30:2e19:d185] in KRDC, it first asks for connection parameters, then for username and password, but after all of this it shows an error message: "Name or service not known".

Comment 1 Urs Wolfer 2015-09-23 17:00:43 UTC

What version of KRDC are you using? Recent KRDC versions are using FreeRDP (xfreerdp) for RDP support. Please try if you can connect with xfreerdp using IPv6.

Comment 2 Paolo Pedroni 2015-09-24 10:14:22 UTC

I can confirm this with krdc 15.08.1 and xfreerdp.

If I use krdc to connect to one of my hosts, which has both an ipv6 and an ipv4 address, it always chooses the ipv4 one.
If I force the ipv6 address (in brackets) I get: "Connection attempt to host failed. Security negotiation or connection failure."
Without brackets I get (of course): "The entered address does not have the required form.
 Syntax: [username@]host[:port]"
If I use xfreerdp from the command line I manage to connect without problems.

Comment 3 Paolo Pedroni 2015-09-24 10:16:43 UTC

I forgot to mention: my freerdp version is 1.2.1_pre20150326 (I'm on gentoo).

Comment 4 Lubos Dolezel 2015-09-24 10:48:13 UTC

This works for me:

xfreerdp /v:[fd00:1::30a2:6a30:2e19:d185]

but KRDC does not. I'm also running 1.2.1_pre20150326 (Gentoo).

Comment 5 Justin Zobel 2022-10-16 07:52:10 UTC

Thank you for reporting this bug in KDE software. As it has been a while since this issue was reported, can we please ask you to see if you can reproduce the issue with a recent software version?

If you can reproduce the issue, please change the status to "CONFIRMED" when replying. Thank you!

Comment 6 Lubos Dolezel 2022-10-17 16:07:07 UTC

Still broken. I can use xfreerdp /v:[2001:1ae9:25f:300:xxx], but when I use e.g. lubos@[2001:1ae9:25f:300:xxx] in KRDC, I get a blue window for a while (after the password prompt) and then it just disappears.

Using an IPv6-only hostname instead of the IPv6 address works, so the problem is not the IPv6 protocol, but really just the direct use of an IPv6 address.

Comment 7 liyqme 2023-01-05 14:35:46 UTC

By running krdc with `QT_LOGGING_RULES` environment variable, it shows the xfreerdp arguments:

$ QT_LOGGING_RULES="KRDC.debug=true" krdc
(... lines omitted ...)
KRDC: Starting xfreerdp with arguments:  "(... other args ...) /port:3389 /v:2400:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx"
(... lines omitted ...)

So the ipv6 address is not bracketed. Related code seems to be at
https://invent.kde.org/network/krdc/-/blob/d0efc2c3/rdp/rdpview.cpp#L339