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From "Joachim Lindenberg" <>
Subject Ubuntu 18.04.1 + Docker -> Installed version of FreeRDP lacks support for the preconnection PDU
Date Mon, 01 Oct 2018 18:37:05 GMT

I installed a new virtual machine, docker, docker-compose, configured the
system – I am referencing guacamole/guacd and guacamole/guacamole from my


Connections to Hyper-V VMs are disconnected immediately (didn´t test
anything else). 

Docker logs guacd reveals the following:


guacd[86]: INFO:        Security mode: NLA

guacd[86]: WARNING:     Installed version of FreeRDP lacks support for the
preconnection PDU. The specified preconnection BLOB and/or ID will be

guacd[86]: INFO:        Resize method: none

guacd[86]: INFO:        User "@d22fb955-b202-44f3-8e0f-918085a68e68" joined
connection "$fbccda9f-4170-4a4c-87ab-e824d1ae8434" (1 users now present)

guacd[86]: INFO:        Loading keymap "base"

guacd[86]: INFO:        Loading keymap "de-de-qwertz"

recv: Connection reset by peer

guacd[86]: ERROR:       Error connecting to RDP server

guacd[86]: INFO:        User "@d22fb955-b202-44f3-8e0f-918085a68e68"
disconnected (0 users remain)

guacd[86]: INFO:        Last user of connection
"$fbccda9f-4170-4a4c-87ab-e824d1ae8434" disconnected

connected to

Error: protocol security negotiation failure

guacd[1]: INFO: Connection "$fbccda9f-4170-4a4c-87ab-e824d1ae8434" removed.


docker exec -it guacd xfreerdp --version

This is FreeRDP version 1.0.2


Is this a known issue? How can I check the freerdp library version? Can I
upgrade the container? What else can I do?

Thanks & Best Regards, Joachim


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