Maik Tralles created GUACAMOLE-1998:
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Summary: Cumulative number of connections are limited to about 60.
Key: GUACAMOLE-1998
URL: https://issues.apache.org/jira/browse/GUACAMOLE-1998
Project: Guacamole
Issue Type: Bug
Components: guacd
Affects Versions: 1.5.5, 1.6.0
Environment: Version: 1.5.5 & latest from the official Dockerhub image
Reporter: Maik Tralles
When the cumulative number of connections reach about 60 user connections, new
ones can't be created.
Version: 1.5.5
{code:java}
guacd_compose | guacd[1645]: INFO: User
"@9d098496-4861-4953-8d7f-0a6818f9943c" joined connection
"$90ce76b4-1dcf-4f1e-9653-0d77d1b25318" (1 users now present)
guacd_compose | guacd[1645]: ERROR: SSH handshake failed.
guacd_compose | guacd[1645]: INFO: User
"@9d098496-4861-4953-8d7f-0a6818f9943c" disconnected (0 users remain)
guacd_compose | guacd[1645]: INFO: Last user of connection
"$90ce76b4-1dcf-4f1e-9653-0d77d1b25318" disconnected{code}
After about 60 connections, new ones can't be created.
Latest (2024-11-04 12:00:00 UTC):
{code:java}
guacd_compose | guacd[1312]: INFO: User
"@4267e072-2b24-4cf8-800a-63fd91ac36d8" joined connection
"$223f505b-f6ca-4dc6-b346-53d6a4233833" (1 users now present)
guacd_compose | GLib (gthread-posix.c): Unexpected error from C library during
'pthread_key_create': Resource temporarily unavailable. Aborting.
guacd_compose | guacd[1]: INFO: Connection
"$223f505b-f6ca-4dc6-b346-53d6a4233833" removed
...
guacd_compose | guacd[1584]: INFO: User
"@e963456d-3bac-4f97-ab1b-89e4845a5470" joined connection
"$d4e67432-840c-42ba-82f1-68d5c0544d84" (1 users now present)
guacd_compose | guacd[1584]: ERROR: SSH handshake failed.
guacd_compose | guacd[1584]: INFO: User
"@e963456d-3bac-4f97-ab1b-89e4845a5470" disconnected (0 users remain)
guacd_compose | guacd[1584]: INFO: Last user of connection
"$d4e67432-840c-42ba-82f1-68d5c0544d84" disconnected {code}
After about 60 connections, the oldest connection will be closed to open the
new connection.
In the logs, we can see a similar issue mentioned in [GUACAMOLE-1920] When the
cumulative number of user connections reaches a certain amount, guacd will
report an error. "RDP server closed/refused connection: Security negotiation
failed (wrong security type?)” - ASF JIRA
Version 1.5.3 seems to work fine with >100 cumulative connections tested on the
same environment.
Affecting SSH + RDP.
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