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From Jason Haar <>
Subject Re: Unreachable RDP desktop after renaming computer
Date Mon, 20 Nov 2017 06:56:23 GMT
telnet'ing to one of these "broken" servers on port 3389 from a terminal on
the guacamole server itself would prove/disprove if there is a network
connectivity issue. If telnet doesn't work, it's not a guacamole issue...

On Sat, Nov 18, 2017 at 8:37 AM, Nick Couchman <> wrote:

> Hi Nick,
>> Thanks very much for the reply. Would DNS caching be an issue if I'm using
>> IP addresses only to create the connections in Guacamole? I should have
>> clarified that I'm only using Amazon EC2 internal network IP addresses for
>> the hostname in the Guacamole connections. Those IPs don't change, as far
>> as
>> I can tell, but I'll double-check that. I'm pretty sure they would if I
>> powered the Windows machines completely off, but I'm only issuing a
>> reboot.
> Okay, yeah, that doesn't sound like DNS - it actually sounds like maybe
> the IP is changing, or something else - the security group, maybe, or
> perhaps the host firewall (if you're joining a Windows domain, maybe it's
> changing the firewall settings from GPO)?
> -Nick


Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +1 408 481 8171
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1

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