Parallels Desktop 27.1.0 and network problems

[GlennGS]

I been using a virtual machine with Debian and Cisco secure client for a long time, but after upgrade to 27.1.0 I been having som issues. The virtual machine seems to work fine until I try connect with the VPN client. The VPN client prompt for username and password and when entered the client try to connect and then network connection is lost. The VPN client hang on trying to connect to….

When this happen it’s the host os that actually lose network connection and therefore all the virtual machines lose network connection as well naturally.

I’ll running Debian 13 in the virtual machine and the VPN client that cause the issue is running in the VM and not on the host OS.

Also using 27.1.0 the VM often hang on shutdown and won’t complete the shutdown. After the vpn problem it always hang on shutdown and i have to kill the task in macOS.

This been working fine with all the previous versions of parallels desktop for several years and rollback to 27.0.3 solve the problem. I’m using two Mac’s with M1 Max and another Mac with M4 Pro both running macOS 27.2 and this happen on both of the Mac’s.

The problem started with parallels 27.1.0 and works fine when I downgrade to 27.0.3.

 

[GlennGS]

Seems like my problem exists on both the M1 Max and M4 Pro. When I start several VMs a once the issues start every time. For example when I start VM 1 and then VM 2 it might work fine, but when I start VM 3 then VM 1 might lose the network and no longer work. VM 3 might work sometimes and sometimes not as well. I can have maximum 2-3 VMs running or there will always be some network issues. When the network problem start in one of the VMs that means no working network at all.

I cannot really see a fixed pattern here, but there must be a bug in 27.1.0 that is causing a lot of network issues. Seems like 27.1.0 should have been removed and development of 27.1.1 should be prioritised. Version 27.1.0 seems to be a horrible release and I see no other option then going back to previous version.

There is obviously some changes in 27.1.0 that is causing this problem.

 

[toaruScar]

Same failure here after updating to Parallels Desktop 27.1.0 (58756). Mac mini on Apple silicon, macOS 27.0.1, Ubuntu guest.

This VM had been running for months. Last night Desktop was updated to 27.1.0. Guest tools were still 27.0.3 at that start, then updated to 27.1.0-58756. After that, running the VM makes the Mac itself lose the network.

An OpenVPN client is running inside the guest, in its own network namespace. Same shape as your Cisco client: a VPN inside the Linux VM, and the host connection dies. And not only that: other devices on the same lan start to have problem getting online, too.

Shutdown matches too. The guest powers off, but prl_vm_app never exits and prlctl stays on stopping. The process sits idle, blocked in CGSEventSourceShutdown on a WindowServer lock. Killing that process is what finally marks the VM stopped. On a later attempt the VM process was already gone and prl_disp_service was still holding the Stopping state.