[GUACAMOLE-1998] Cumulative number of connections are limited to about 60.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.5.5
• Component/s: guacd
• Environment: Version: 1.5.5 & latest from the official Dockerhub image
• Assignee: Unassigned
• Reporter: Maik Tralles
• Created: 05/Nov/24 09:20
• Updated: 06/Dec/24 08:57

Description

When the cumulative number of connections reach about 60 user connections, new ones can't be created.

Version: 1.5.5

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

After about 60 connections, new ones can't be created.

 

Latest (2024-11-04 12:00:00 UTC):

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 

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.