Bug 429690

Summary:	KDE Connect detects phones but won't detect other computers
Product:	[Applications] kdeconnect	Reporter:	Mauro <capo_drugo>
Component:	common	Assignee:	Albert Vaca Cintora <albertvaka>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	988alex, danielzgtg.opensource, nicolas.fella, sephiroth_pk
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Mauro 2020-11-26 14:28:10 UTC

I have two desktop with Kubuntu and one smartphone, all are equipped with kdeconnect.

Until Kubuntu 20.04 all devices were paired and each one could see the other.

Since Kubuntu 20.10, desktops can see the smartphone, the smartphone can see both the desktops, but one desktop can't see the other desktop and vice-versa.

I tried to purge kdeconnect, same result.

One curious thing: if I try to search for new devices from one desktop, it seems to find the other one, as for an instant its name shows in the list, but it disappears immediately!

Comment 1 Mauro 2021-02-26 15:17:10 UTC

Proposed solution:
https://askubuntu.com/a/1319494/32230

Comment 2 Daniel Tang 2021-03-02 22:46:42 UTC

SUMMARY

I can't connect two Linux computers together. Both of the computers connect fine to my Android though.

STEPS TO REPRODUCE
1. Open the device list
2. Click refresh

OBSERVED RESULT

The other computer doesn't show up in the list.
Sometimes it appears for a split second then disappears.

When running `kdeconnectd` from the command line, I get the following errors logged:

```
kdeconnect.core: Disconnecting due to fatal SSL Error:  "The issuer certificate of a locally looked up certificate could not be found"
kdeconnect.core: Disconnecting due to fatal SSL Error:  "No certificates could be verified"
```

EXPECTED RESULT

Each computer should show up and appear properly on the other computer.

ANALYSIS

If I patch the code to also ignore `QSslError::UnableToGetLocalIssuerCertificate` and `QSslError::UnableToVerifyFirstCertificate`, the computers pair and connect properly. However, they stop working after `kdeconnectd` is stopped and restarted on any of them. When clicking refresh a bunch of times during the initial pairing, I see a lot of messages about the key being different for the same device.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 21.04
KDE Plasma Version: 5.21.1
KDE Frameworks Version: 5.79.0
Qt Version: 5.12.2
kdeconnect-kde: Git 44a7fc226fcd35bd082d78836ad2a3787ccde5b9

Comment 3 Mauro 2021-03-03 05:49:48 UTC

@Daniel Tang: can you try the above proposal?

Comment 4 Daniel Tang 2021-03-03 21:44:48 UTC

> Proposed solution:

That is more like a hack rather than a solution.

> can you try the above proposal?

I tried it and it works. openssl-1.1.1h was missing so I used openssl-1.1.1j.

However, I downgraded the packages right after confirming that they work. I don't want to break everything else on my machine. I also don't know the security implications of installing a cryptography package from an untrusted source like a PPA

> It will definitely solved in 21.04

I am on 21.04. We're already in Feature Freeze and this bug still isn't fixed

Comment 5 Daniel Tang 2021-03-11 03:07:24 UTC

On or before 2020-03-09, openssl-1.1.1j reached the main Ubuntu 21.04 repo. KDE Connect now works properly between my two Linux computers now.

@Mauro: Did the update also reach you?

Comment 6 Mauro 2021-03-11 11:03:28 UTC

 @Daniel no, because I'm NOT on 21.04 yet. As I wrote, I'm on 20.10 and the only package that is available for me via PPA is the one I proposed.

Comment 7 Riccardo Robecchi 2022-01-12 11:48:42 UTC

Marking this as a duplicate of 424606 as the symptoms and solution match.

*** This bug has been marked as a duplicate of bug 424606 ***