Wolfgang created GUACAMOLE-2274:
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Summary: guacd 1.6.0 fails to connect to xrdp while 1.5.5 works
Key: GUACAMOLE-2274
URL: https://issues.apache.org/jira/browse/GUACAMOLE-2274
Project: Guacamole
Issue Type: Bug
Components: guacd
Affects Versions: 1.6.0
Environment: Apache Guacamole / guacd 1.6.0
xrdp on Debian Linux
Docker deployment
Browser access via HTTPS reverse proxy
Reporter: Wolfgang
Observed behavior:
RDP connections from guacd 1.6.0 to xrdp fail during the early RDP activation /
MCS phase.
The same xrdp server works correctly with:
* Microsoft mstsc
* guacd 1.5.5
The issue disappears immediately after downgrading guacd from 1.6.0 to 1.5.5
while keeping the identical infrastructure and configuration.
xrdp log:
* libxrdp_force_read: header read error
* Processing [ITU-T T.125] ErectDomainRequest failed
guacd debug log:
* Timeout waiting for activation
* RDP server closed/refused connection: Disconnected.
Important observations:
* TLS / SSL settings are NOT the root cause.
* The issue also occurs with security_layer=rdp.
* The issue occurs with security modes ANY, SSL and RDP.
* SSH connections through Guacamole work correctly.
* xrdp works out-of-the-box from mstsc and from guacd 1.5.5.
Working configuration:
* guacamole/guacd:1.5.5
Failing configuration:
* guacamole/guacd:1.6.0
Conclusion:
This appears to be a regression in guacd 1.6.0 (possibly FreeRDP-related)
affecting xrdp compatibility during the early RDP handshake / activation phase.
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