Client not update error and no connection to clients

[FuchsEDV-MC]

Server Info (please complete the following information):

• OS: Ubuntu 20.04.5
• Browser: chrome,Firefox,Edge
• RMM Version (as shown in top left of web UI): v0.15.0

Installation Method:

• Standard

Agent Info (please complete the following information):

• Agent version (as shown in the 'Summary' tab of the agent from web UI): most of them are v2.0.4
• Agent OS: All types of Windows (10,11,SRV2012R2-2022)

Describe the bug
On 06.September 2022 at 20:30 all of our 474 Agents went offline and wont came back online.
There is no response since then.
When checking the Tactical RMM Software on the clients they say "Agent: running, Mesh Agent: running".
But:

• Changes like Hostname or new Software on the client won't change in Tactical
• Agent Update not working
• Patch Management not working
• Run Script not working
• Software Install over Tactical not working

Still Working:
Old Harddrive Checks are working - we receive the notifications
Take Control (Mesh Agent) is working

When we manually update a client or intall a new one then its working perfectly

It there a way to update all old (v.2.0.4 or older) clients automaticaly?
Which kind of tests could we perform to pinpoint and eliminate the fault?

[wh1te909]

start with reading the docs troubleshooting section and post your findings https://docs.tacticalrmm.com/troubleshooting/

[wh1te909]

also please read the 0.14.0 release notes it sounds like you closed port 4222 before allowing your agents to update (agent v2.0.4 was the last version to use 4222 before the move to websockets)