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Local VEPro instantly disconnects after connecting.
Last post Mon, Mar 13 2017 by cmatt, 10 replies.
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Posted on Thu, Apr 16 2015 19:48
by jdtolman
Joined on Thu, Aug 04 2011, Posts 1

I don't know if this is a Cubase issue or a VE Pro issue.

I'm Using VE Pro 4, though the same problem exists in VE Pro 5 with a trial license.

In Cubase 8.0.10, I have a large 230 track orchestral template, using 2 instances of VE Pro - one local and one on a remote PC.  (Both are running Windows 7)  When I started the project, everything was fine.  But after rebooting and reloading, the local instance of VE Pro in the server window shows as connected to the local machine, however no midi data transmits.  Also, if I look inside Cubase at the VST Rack for the local instance of VE Pro is shows DISCONNECTED, and I don't see my populated VE Pro instance because outside of cubase it thinks it's connected.

If I force a disconnect in the VE Pro Server, inside Cubase I can see it in my list and reconnect to it.  It shows connected in the Cubase hosted plugin, but again no midi is transferred, and if I bring the plugin back up a 2nd time, it shows DISCONNECTED -- back to the original problem state.  (Connected according to server pane, disconnected according to plugin inside Cubase).

As for the the remote hosted instance of VE Pro, it has no issues at all.

Additionally, if I load my Cubase project with empty VE Pro Servers - the remotely hosted instance loads the template, but the local one brings up an empty VE Pro instance (with the same connected/disconnected problem as above when I have the template pre-loaded).   Also, each VE Pro instance hosts about 8 Kontakt 5 instances.

Any ideas on this odd behavior?

Posted on Thu, May 07 2015 18:36
by Fred72
Joined on Thu, Jun 23 2011, Posts 4

Also having this exact same issue. From some testing I'm wondering if it has to do with the "size" of the VE Pro Instance I'm trying to connect to. For example, I can connect and disconnect without trouble to a VE Pro Instance with a few instances of Kontakt running inside it, but if I try the full 9-Kontakt instance I'd like to be running, this glitch appears.

To reiterate: The local instance appears in the connection list. Selecting it and clicking "connect" causes it to fall off this list. In the VE Pro Server pane, this instance will register as connected. But the plugin within Cubase will still read as "Disconnected."

Cubase 8.0.1
VE Pro 5.4
Mac OS 10.10.3

Posted on Thu, May 07 2015 19:09
by magnumpraw
Joined on Tue, Oct 04 2005, Los Angeles, Posts 142

I have had this exact same issue. If I disconnect a VEPro instance while the session is active and then try to reconnect, the slave instance registers as connected, but no MIDI data is transferred. In Cubase, the plugin no longer sees the slave computer in the list of available instances, but it does not register as being connected to any instance.

This happens in Digital Performer as well as Cubase.

Posted on Wed, May 20 2015 09:26
by michaelfirmont
Joined on Fri, Aug 17 2012, Posts 13

I have the same problem within Pro Tools!

and in addition all VSL VEP VST3 PlugIns are not working within Cubase. Some help would be really great :/

Posted on Wed, May 20 2015 12:54
by Paul
Joined on Sat, Aug 03 2002, Vienna, Posts 12196


We cannot seem to reproduce this here. Can you please send some sequencer projects to , with a short reference to this thread?

Please include which versions of all involved software (sequencer, VE PRO 5, Kontakt, additional plug-ins) you are using. 


Paul Kopf
Product Manager - Vienna Symphonic Library
Posted on Thu, Jul 30 2015 19:33
by djbradycomposer
Joined on Mon, Jul 27 2015, Los Angeles, CA, Posts 1

I was having a similar issue with my slave machine (Mac mini) suddenly losing its connection and having to force-disconnect in the server instance on the Mac mini in order for it to appear in the host plug-in window as an option to reconnect to. Additionally, it was causing the MOTU Audio System (MAS) to shut off. I was using the MAS version of the VEP plugin.

Once I woke up the Mac mini, did a force-disconnect, and relaunched MAS, everything seemed to behave normally again.

Did a test and set my Mac mini to never go to sleep and I did not encounter the problem. Hopefully that helps some of you...was driving me crazy!

Posted on Sun, Jul 24 2016 03:11
by asabatino
Joined on Tue, May 26 2015, Posts 1

Was this ever resolved? I am having the same issue and it is extremely inconvinient. I have wasted over a week with constant troubleshooting and it essentially renders my files uselsess when I try to onnect them. Hoping for a solution!

Anthony Sabatino - Film Composer
Logic Pro X, VEP 5
Posted on Mon, Mar 13 2017 11:30
by cmatt
Joined on Tue, Jan 07 2014, Posts 10


    I have been using VE Pro5 on OSX with Pro Tools and Cubase (Host), connected to a Slave Windows PC, everything worked fine.

Now I switched to a Windows 10 host PC running Cubase 8.5 / 9. I keep getting the disconnect problem continually, only when I try to connect to a local instance. I'd like to give more info, but I'm still changing so much all the time, since I'm still setting up...

Did anyone find out what happens? I would expect a local connection to be the least trouble...


Posted on Mon, Mar 13 2017 12:08
by Paul
Joined on Sat, Aug 03 2002, Vienna, Posts 12196

Hi cmatt, 

It's usually sleep settings, AV programs with extreme settings, firewalls or third party programs like "Little Snitch" that interfere with network connections. 


Paul Kopf
Product Manager - Vienna Symphonic Library
Posted on Mon, Mar 13 2017 12:42
by cmatt
Joined on Tue, Jan 07 2014, Posts 10

thanks Paul,

 it seems that if I open a Server Project, all is fine, but if I start a new instance from scratch the disconnecting happens.

I'll keep checking...


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