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The color of ZBX Availability is changing into red from green and getting following error message on Zabbix Active Check monitoring:

"Get value from agent failed: TCP successful, cannot establish TLS to ][0.0.0.0]:10050]: connection closed by peer"

Please help.

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That's a passive item error, not active.

The 0.0.0.0 address likely comes from host interfaces - you should fix that. If you wanted to use active items, you still have passive ones configured - change them all, including LLD rules and LLD prototypes to active.

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