Hi, I’m building a web app based on guacamole 1.4.0 and users report connection disconnected frequently. I found that when this occurs, the tunnel status code is 519(0x207) which throws by GuacamoleUpstreamNotFoundException, the guacd log says ‘User is not responding’ as bellow:
Mar 30 13:32:58 localhost guacd[3884630]: User "@25878c10-2d03-41e9-9037-978ef4fde75e" joined connection "$db89b7f3-952a-41ef-bf3f-a4f43b53a7ee" (1 users now present) Mar 30 13:32:58 localhost guacd[3884630]: Client is using protocol version "VERSION_1_3_0" Mar 30 13:32:58 localhost guacd[3884630]: Using non-standard VNC clipboard encoding: 'UTF-8'. Mar 30 13:32:58 localhost guacd[3884630]: VNC server supports protocol version 3.7 (viewer 3.8) Mar 30 13:32:58 localhost guacd[3884630]: We have 1 security types to read Mar 30 13:32:58 localhost guacd[3884630]: 0) Received security type 18 Mar 30 13:32:58 localhost guacd[3884630]: Selecting security type 18 (0/1 in the list) Mar 30 13:32:58 localhost guacd[3884630]: Selected Security Scheme 18 Mar 30 13:32:58 localhost guacd[3884630]: GnuTLS version 3.7.3 initialized. Mar 30 13:32:58 localhost guacd[3884630]: TLS session initialized. Mar 30 13:32:58 localhost guacd[3884630]: TLS anonymous credential created. Mar 30 13:32:58 localhost guacd[3884630]: TLS handshake blocking. Mar 30 13:32:59 localhost guacd[3884630]: TLS handshake blocking. Mar 30 13:33:00 localhost guacd[3884630]: TLS handshake done. Mar 30 13:33:00 localhost guacd[3884630]: We have 1 security types to read Mar 30 13:33:00 localhost guacd[3884630]: 0) Received security type 2 Mar 30 13:33:00 localhost guacd[3884630]: Selecting security type 2 (0/1 in the list) Mar 30 13:33:00 localhost guacd[3884630]: Libgcrypt warning: missing initialization - please fix the application Mar 30 13:33:00 localhost guacd[3884630]: VNC authentication succeeded Mar 30 13:33:00 localhost guacd[3884630]: Desktop name "jenkins@SQE-ATT-NT2-CN-157" Mar 30 13:33:00 localhost guacd[3884630]: Connected to VNC server, using protocol version 3.7 Mar 30 13:33:00 localhost guacd[3884630]: VNC server default format: Mar 30 13:33:00 localhost guacd[3884630]: 32 bits per pixel. Mar 30 13:33:00 localhost guacd[3884630]: Least significant byte first in each pixel. Mar 30 13:33:00 localhost guacd[3884630]: TRUE colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0 Mar 30 13:33:51 localhost guacd[3884630]: User is not responding. Mar 30 13:33:51 localhost guacd[3884630]: User "@25878c10-2d03-41e9-9037-978ef4fde75e" disconnected (0 users remain) Mar 30 13:33:51 localhost guacd[3884630]: Last user of connection "$db89b7f3-952a-41ef-bf3f-a4f43b53a7ee" disconnected Mar 30 13:33:51 localhost guacd[3884630]: Requesting termination of client... Mar 30 13:33:51 localhost guacd[3884630]: Internal VNC client disconnected Mar 30 13:33:51 localhost guacd[3884630]: Client terminated successfully. I want to know the reason of this error and how to avoid this. I guess bad network will cause this but not sure. Do you have any ideas about this? Thanks a lot.