Hi Florian,

Florian Fuessl wrote:
> running open-vm-tools 2008.11.18-130226 on Debian Lenny within ESX 2.5.4
> build-119703 produces the following error msgs about every 30s in the
> vmware.log files of the virtual machines:

First, a disclaimer: the version of ESX you're running is really old (even if 
the build is recent, the 2.5.x line is really old). One of the issues we have 
with Tools is that they're not really certified to run on a lot of different 
VMware platforms; so while it's very probably that they will work on recent 
VMware products, we don't make any guarantees about older versions.

That being said...

 > Jul 03 00:56:31: vcpu-0| GuestMsg: Unknown protocol magic number.
 > Jul 03 00:56:59: vcpu-0| GuestMsg: Unknown protocol magic number.
 > Jul 03 00:57:01: vcpu-0| GuestMsg: Unknown protocol magic number.

This is pretty interesting, because the magic numbers it's talking about 
haven't 
changed. My best guess without going into the code too much is that something 
changed slightly in the protocol that Tools uses to talk to the host (something 
other than the magic number) and it's causing that...

If you have a more recent VMware product around where you can test it, it would 
be useful to know if you still see it there, to rule out any compilation issue 
or any patches you may have (it's not clear whether you're compiling Tools 
yourself or using the Debian packages, if they exist).

> Do you have any hints how to further debug or come around this problem?

You could enable Tools logging so that we have an idea of what Tools are doing 
when those messages show up on the host. With that particular release of 
open-vm-tools, I think adding these two lines to /etc/vmware-tools/tools.conf 
should do it:

log = "TRUE"
log.file = "/path/to/log/file"

-- 
- Marcelo

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