<![CDATA[Too many communication sessions open - unable to accept new connection]]>Hello,

i noticed in agentd log:

Too many communication sessions open - unable to accept new connection

and i noticed that my ssh dci's dont update ...

i read the manual and forum but could not find a solution.

]]>https://forum.netxms.org/topic/7742/too-many-communication-sessions-open-unable-to-accept-new-connectionRSS for NodeFri, 13 Nov 2026 10:21:03 GMTWed, 30 Aug 2023 08:40:45 GMT60<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Mon, 09 Oct 2023 07:42:19 GMT]]>Please add
DebugLevel = 6
to agent config file and share full agent log since it's start till sessions run out. You can share the log in private message if needed.

]]>https://forum.netxms.org/post/32871https://forum.netxms.org/post/32871Mon, 09 Oct 2023 07:42:19 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Mon, 02 Oct 2023 16:34:57 GMT]]>2023.10.02 18:32:48.183 *I* [linux              ] Unable to parse /proc/drbd, DRBD data collector will not start
2023.10.02 18:32:48.184 *I* [subagents          ] Subagent "Linux" (/usr/lib/x86_64-linux-gnu/netxms/linux.nsm) loaded successfully (version 4.4.2)
2023.10.02 18:32:48.187 *I* [subagents          ] Subagent "SSH" (/usr/lib/x86_64-linux-gnu/netxms/ssh.nsm) loaded successfully (version 4.4.2)
2023.10.02 18:32:48.187 *I* [subagents          ] Subagent "PING" (/usr/lib/x86_64-linux-gnu/netxms/ping.nsm) loaded successfully (version 4.4.2)
2023.10.02 18:32:48.188 *I* [startup            ] System hardware IDxxxxxxxxxxxxxx
2023.10.02 18:32:49.193 *I* [comm              ] Listening on socket 0.0.0.0:4700
2023.10.02 18:32:49.193 *I* [comm              ] Listening on socket :::4700
2023.10.02 18:32:49.193 *I* [comm              ] Control connector is disabled
2023.10.02 18:32:50.194 *I* [filemon            ] Path list for file monitor is empty
2023.10.02 18:32:50.194 *I* [                  ] NetXMS Agent started
2023.10.02 18:33:19.588 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:19.588 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:21.027 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:24.592 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:24.592 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:24.592 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:24.592 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:25.038 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:25.042 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:25.044 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:25.074 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:35.065 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:35.067 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:35.069 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:36.086 *W* [comm              ] Too many communication sessions open - unable to accept new connection
2023.10.02 18:33:39.568 *W* [comm              ] Too many communication sessions open - unable to accept new connection

]]>https://forum.netxms.org/post/32865https://forum.netxms.org/post/32865Mon, 02 Oct 2023 16:34:57 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Wed, 20 Sep 2023 16:25:59 GMT]]>How much time does it take since agent restart to consume all the sessions?

In out-of-the-box template for the agent there are metrics
Agent.ActiveConnections
Agent.AcceptedConnections

please show graphs for these for the time since agent start till the sessions run out

]]>https://forum.netxms.org/post/32790https://forum.netxms.org/post/32790Wed, 20 Sep 2023 16:25:59 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Fri, 08 Sep 2023 14:16:40 GMT]]>yes

agent conf:

# Log File
LogFile=/var/log/nxagentd

# IP white list, can contain multiple records separated by comma.
# CIDR notation supported for subnets.
MasterServers=127.0.0.1
SubAgent=ssh.nsm
SubAgent=ping.nsm
[SSH]
ConfigFile = /etc/nxagentd-ssh-config
MaxSessions=500

even tried adding MaxSessions=500 in /etc/nxagentd-ssh-config....

no luck

]]>https://forum.netxms.org/post/32742https://forum.netxms.org/post/32742Fri, 08 Sep 2023 14:16:40 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Fri, 08 Sep 2023 14:03:10 GMT]]>Have you restarted the agent after adding MaxSessions parameter?

]]>https://forum.netxms.org/post/32741https://forum.netxms.org/post/32741Fri, 08 Sep 2023 14:03:10 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Tue, 05 Sep 2023 08:09:13 GMT]]>Hello,
yes i have a lot of ssh metrics configured.
i tried to set MaxSessions to 100 and 500 but the log is full of error message.

it is no agent proxy, agent is netxms server itself.

]]>https://forum.netxms.org/post/32721https://forum.netxms.org/post/32721Tue, 05 Sep 2023 08:09:13 GMT<![CDATA[Reply to Too many communication sessions open - unable to accept new connection on Thu, 31 Aug 2023 10:44:14 GMT]]>Try adding
MaxSessions = 100
to agent configuration file (default for this setting is 32 - https://netxms.org/documentation/adminguide/appendix.html#agent-configuration-file-nxagentd-conf)

Are you collecting a lot of ssh metrics, do these metrics take long time to return value? Or is this agent a proxy or loaded with some other tasks? I just wonder why many sessions are used at the same time.

]]>https://forum.netxms.org/post/32707https://forum.netxms.org/post/32707Thu, 31 Aug 2023 10:44:14 GMT