Good Afternoon,

The Auto-link Nodes feature on the custom map type seems to have stopped working somewhere between the NetXMS server version 6.0.5 to 6.2.4. I can confirm it was working fine on 6.0.5 .

For example, trying to link two nodes together on a Layer 2 topology map works as intended, but when trying the exact same on a custom map type it does not link them together anymore.

Furthermore existing maps on which I already used the Auto-link nodes feature retain the links,
although when removing them and replacing them with new auto-links, it also doesn't work.

Has anyone else encountered this or even know of a potential fix / workaround?

Hopefully some more information will be helpful in resolving the issue. 
All of this is from the About NetXMS Management Client section.
The first block is from the old 6.0.5 version, the second one from the new 6.2.5 version.

Version 6.0.5

Connected to 172.20.20.20 (172.20.20.20) as admin
Server version: 6.0.5 (build 6.0-596-gda553d00de)
Java version: 17.0.19
JVM: OpenJDK 64-Bit Server VM 17.0.19+10
Operating system: Linux (7.1.5-76070105-generic)

Version 6.2.5

Connected to 172.20.20.20 (172.20.20.20) as admin
Server version: 6.2.5 (build 6.2-832-g5c3117069c)
Java version: 17.0.20.1
JVM: OpenJDK 64-Bit Server VM 17.0.20.1+1
Operating system: Linux (7.1.5-76070105-generic)

Hi,

Confirmed, this is a bug in the 6.2 management client, not in the server or your setup. Since 6.2.0 the Auto-link action sends an empty node list to the server, so it reports success and creates nothing. Layer 2 maps are not affected because their links are built by the server from topology data. Fix is tracked in https://github.com/netxms/netxms/issues/3681 and will be in the next 6.2 release.

Until then, "Link objects" still works, but it links two objects at a time and doesn't bind the link to interfaces.