Keeps connection open when explicitly closed, and then crashes

Description

I often work on multiple databases at the same time where some are connected via an SSH tunnel (not in Heidi, but via the SSH connection directly)

When I explicitly disconnect the server connection in HeidiSQL and then close the SSH tunnel, HeidiSQL hangs and then has to be terminated and restarted.

And when Heidi is restarted, Heidi tries to reconnect to the previously disconnected server, and fails.

I have to close HeidiSQL manually and reopen for it to "forget" the previous connection.

I don't think its related to the SSH tunnelling, this is just how I connect to some remote servers, I think it just has to be a remote server that is unavailable for this to happen.

Issue might be related to #2604

HeidiSQL version and OS

12.21.1.1, Linux (KUbuntu 26)

Database server version

Reproduction recipe

Open a connection to a local database.
Open a connection to a database over an SSH tunnel, established in the OS and not in Heidi.
Perform a query on the remote database.
Explicitly close remote connection.
Shut down SSL tunnel.
Try and perform a local query. (It's not always instant)

HeidiSQL hangs and needs to terminated.

And when reopening, the previously explicitly disconnected server is still active.

Error/Backtrace

Just a note: you may have enabled auto-connecting:

Are you sure it hangs "forever" ? Did you give it at least 30s or 60s ?

Yes, I have automatic reconnection enabled, but I would not expect Heidi to reconnect to a server that I have explicitly disconnected (via right-click and then Disconnect from the context menu)

A guess on my behalf would be that it seems like the list of connected servers is only being saved when Heidi is closed, and not when a change in the connected serverlist happens.

I have given it 30 seconds, not sure i've ever had the patience to wait a full minute, but i'll try and see if that changes anything.

Tried letting it be for a couple of minutes, no change.

Nothing seems to happen until I click the "Close window" button, then it hangs for a bit longer and then I have to terminate Heidi, which when reopened still tries to reconnect to the explicitly disconnected server.

Crash log

           PID: 377067 (heidisql)
           UID: 1000 (anonymized)
           GID: 1000 (anonymized)
        Signal: 6 (ABRT)
     Timestamp: Wed 2026-10-14 12:41:58 CEST (3s ago)
  Command Line: /usr/bin/heidisql
    Executable: /usr/share/heidisql/heidisql
 Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-heidisql@40889d5b5a2c4b258a230463b9c18412.service
          Unit: user@1000.service
     User Unit: app-heidisql@40889d5b5a2c4b258a230463b9c18412.service
         Slice: user-1000.slice
     Owner UID: 1000 (anonymized)
       Boot ID: 3b10b7361e3445868045a69eaf42b739
    Machine ID: 3efdae5757f64d60ac2f78716a08b734
      Hostname: anonymized-linux
       Storage: /var/lib/systemd/coredump/core.heidisql.1000.3b10b7361e3445868045a69eaf42b739.377067.1791974518000000.zst (present)
  Size on Disk: 70.5M
       Message: Process 377067 (heidisql) of user 1000 dumped core.
                
                Module /usr/share/heidisql/heidisql without build-id.
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                Module libatomic.so.1 from deb gcc-16-16-20260322-1ubuntu1.amd64
                Module libexpat.so.1 from deb expat-2.7.4-1ubuntu0.2.amd64
                Module libGLdispatch.so.0 from deb libglvnd-1.7.0-3.amd64
                Module libXdmcp.so.6 from deb libxdmcp-1:1.1.5-2.amd64
                Module libXau.so.6 from deb libxau-1:1.0.11-1build2.amd64
                Module libzstd.so.1 from deb libzstd-1.5.7+dfsg-3.amd64
                Module libpcre2-16.so.0 from deb pcre2-10.46-1build1.amd64
                Module libb2.so.1 from deb libb2-0.98.1-1.1build2.amd64
                Module libdouble-conversion.so.3 from deb double-conversion-3.4.0-1.amd64
                Module libicuuc.so.78 from deb icu-78.2-2ubuntu1.amd64
                Module libicui18n.so.78 from deb icu-78.2-2ubuntu1.amd64
                Module libz.so.1 from deb zlib-1:1.3.dfsg+really1.3.1-1ubuntu3.1.amd64
                Module libfreetype.so.6 from deb freetype-2.14.2+dfsg-1ubuntu0.2.amd64
                Module libmd4c.so.0 from deb md4c-0.5.2-2build1.amd64
                Module libharfbuzz.so.0 from deb harfbuzz-12.3.2-2.amd64
                Module libpng16.so.16 from deb libpng1.6-1.6.57-1ubuntu0.1.amd64
                Module libOpenGL.so.0 from deb libglvnd-1.7.0-3.amd64
                Module libGLX.so.0 from deb libglvnd-1.7.0-3.amd64
                Module libxkbcommon.so.0 from deb libxkbcommon-1.13.1-1.amd64
                Module libQt6DBus.so.6 from deb qt6-base-6.10.2+dfsg-7.amd64
                Module libglib-2.0.so.0 from deb glib2.0-2.88.0-1ubuntu0.1.amd64
                Module libfontconfig.so.1 from deb fontconfig-2.17.1-3ubuntu1.amd64
                Module libEGL.so.1 from deb libglvnd-1.7.0-3.amd64
                Module libxcb.so.1 from deb libxcb-1.17.0-2ubuntu1.amd64
                Module libgcc_s.so.1 from deb gcc-16-16-20260322-1ubuntu1.amd64
                Module libstdc++.so.6 from deb gcc-16-16-20260322-1ubuntu1.amd64
                Module libQt6Core.so.6 from deb qt6-base-6.10.2+dfsg-7.amd64
                Module libQt6Gui.so.6 from deb qt6-base-6.10.2+dfsg-7.amd64
                Module libQt6Widgets.so.6 from deb qt6-base-6.10.2+dfsg-7.amd64
                Module libQt6PrintSupport.so.6 from deb qt6-base-6.10.2+dfsg-7.amd64
                Module libX11.so.6 from deb libx11-2:1.8.13-1ubuntu0.1.amd64
                Module libQt6Pas.so.6 from deb libqt6pas-2.3.amd64
                Stack trace of thread 377067:
                #0  0x000078b3e2eac802 __syscall_cancel_arch (libc.so.6 + 0xac802)
                #1  0x000078b3e2ea039c __internal_syscall_cancel (libc.so.6 + 0xa039c)
                #2  0x000078b3e2f2816e __GI___libc_read (libc.so.6 + 0x12816e)
                #3  0x000078b3d4b349c7 n/a (libcrypto.so.3 + 0x1349c7)
                #4  0x000078b3d4b27733 n/a (libcrypto.so.3 + 0x127733)
                #5  0x000078b3d4b25807 n/a (libcrypto.so.3 + 0x125807)
                #6  0x000078b3d4b25edb BIO_read (libcrypto.so.3 + 0x125edb)
                #7  0x000078b3d51968a3 n/a (libssl.so.3 + 0xa78a3)
                #8  0x000078b3d5196c4b n/a (libssl.so.3 + 0xa7c4b)
                #9  0x000078b3d51958ca n/a (libssl.so.3 + 0xa68ca)
                #10 0x000078b3d518dafa n/a (libssl.so.3 + 0x9eafa)
                #11 0x000078b3d511fce6 n/a (libssl.so.3 + 0x30ce6)
                #12 0x000078b3d512efab SSL_read (libssl.so.3 + 0x3ffab)
                #13 0x000078b39529ae30 n/a (libmysqlclient.so.24 + 0x9ae30)
                #14 0x000078b39524b86e n/a (libmysqlclient.so.24 + 0x4b86e)
                #15 0x000078b395256bc2 n/a (libmysqlclient.so.24 + 0x56bc2)
                #16 0x000078b39523676c n/a (libmysqlclient.so.24 + 0x3676c)
                #17 0x000078b39523b32f n/a (libmysqlclient.so.24 + 0x3b32f)
                #18 0x000078b39523426a mysql_ping (libmysqlclient.so.24 + 0x3426a)
                #19 0x000000000050259b n/a (/usr/share/heidisql/heidisql + 0x10259b)
                #20 0x000000000051f6b7 n/a (/usr/share/heidisql/heidisql + 0x11f6b7)
                #21 0x000000000080c1e6 n/a (/usr/share/heidisql/heidisql + 0x40c1e6)
                #22 0x000000000081ce63 n/a (/usr/share/heidisql/heidisql + 0x41ce63)
                #23 0x000000000080b4a8 n/a (/usr/share/heidisql/heidisql + 0x40b4a8)
                #24 0x00000000007ffad0 n/a (/usr/share/heidisql/heidisql + 0x3ffad0)
                #25 0x000000000042c94a n/a (/usr/share/heidisql/heidisql + 0x2c94a)
                #26 0x000000000063d373 n/a (/usr/share/heidisql/heidisql + 0x23d373)
                #27 0x0000000000811f27 n/a (/usr/share/heidisql/heidisql + 0x411f27)
                #28 0x00000000006e7ef1 n/a (/usr/share/heidisql/heidisql + 0x2e7ef1)
                #29 0x00000000006e3e5c n/a (/usr/share/heidisql/heidisql + 0x2e3e5c)
                #30 0x00000000006e1fce n/a (/usr/share/heidisql/heidisql + 0x2e1fce)
                #31 0x0000000000701ccd n/a (/usr/share/heidisql/heidisql + 0x301ccd)
                #32 0x0000000000702e41 n/a (/usr/share/heidisql/heidisql + 0x302e41)
                #33 0x000078b3e33d3322 n/a (libQt6Pas.so.6 + 0x1d3322)
                #34 0x000078b3e178c644 _ZN23QCoreApplicationPrivate29sendThroughObjectEventFiltersEP7QObjectP6QEvent (libQt6Core.so.6 + 0x18c644)
                #35 0x000078b3e27a0b6f _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0x1a0b6f)
                #36 0x000078b3e27a5cff _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0x1a5cff)
                #37 0x000078b3e1790098 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x190098)
                #38 0x000078b3e2797d89 _ZN19QApplicationPrivate14sendMouseEventEP7QWidgetP11QMouseEventS1_S1_PS1_R8QPointerIS0_Ebb (libQt6Widgets.so.6 + 0x197d89)
                #39 0x000078b3e2815a52 n/a (libQt6Widgets.so.6 + 0x215a52)
                #40 0x000078b3e28191c0 n/a (libQt6Widgets.so.6 + 0x2191c0)
                #41 0x000078b3e27a0b7f _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0x1a0b7f)
                #42 0x000078b3e1790098 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x190098)
                #43 0x000078b3e1ddb56f _ZN22QGuiApplicationPrivate17processMouseEventEPN29QWindowSystemInterfacePrivate10MouseEventE (libQt6Gui.so.6 + 0x1db56f)
                #44 0x000078b3e1e3a2dc _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Gui.so.6 + 0x23a2dc)
                #45 0x000078b3e22826c4 n/a (libQt6Gui.so.6 + 0x6826c4)
                #46 0x000078b3e1508c1b n/a (libglib-2.0.so.0 + 0x60c1b)
                #47 0x000078b3e150a257 n/a (libglib-2.0.so.0 + 0x62257)
                #48 0x000078b3e150a443 g_main_context_iteration (libglib-2.0.so.0 + 0x62443)
                #49 0x000078b3e1a0513d _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x40513d)
                #50 0x0000000000617627 n/a (/usr/share/heidisql/heidisql + 0x217627)
                #51 0x0000000000465a57 n/a (/usr/share/heidisql/heidisql + 0x65a57)
                #52 0x000000000046786c n/a (/usr/share/heidisql/heidisql + 0x6786c)
                #53 0x0000000000467dbf n/a (/usr/share/heidisql/heidisql + 0x67dbf)
                #54 0x0000000000617603 n/a (/usr/share/heidisql/heidisql + 0x217603)
                #55 0x0000000000467d67 n/a (/usr/share/heidisql/heidisql + 0x67d67)
                #56 0x0000000000421cbe n/a (/usr/share/heidisql/heidisql + 0x21cbe)
                ELF object binary architecture: AMD x86-64

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Keeps connection open when explicitly closed, and then crashes #2631

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HeidiSQL version and OS

Database server version

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Keeps connection open when explicitly closed, and then crashes #2631

Description

Description

HeidiSQL version and OS

Database server version

Reproduction recipe

Error/Backtrace

Activity

ansgarbecker commented on Oct 12, 2026

FlyveHest commented on Oct 13, 2026

FlyveHest commented on Oct 14, 2026

FlyveHest commented on Oct 14, 2026

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