I am getting this error: ‘Pooled socket is dead. Continuing to next one’

I am getting ‘Pooled socket is dead’ error after installing Couchbase Server Enterprise 6.6.1… Below is the detail of the error message. I am stuck for days now. Any help please?

[error] 17518#17518: *7703 FastCGI sent in stderr: "PHP message: [cb,WARN] (lcbio_mgr L:483 I:3887268011) <localhost:8093> 
(HE=0x56542f856a50) Pooled socket is dead. Continuing to next one" while reading response header from upstream, client: 

I’ve thought of firewall issue and tried disabling firewall, enabling ports in firewall and none worked…

Hello @comet what is the version of PHP SDK that you are using and what is your query looking like ? the N1QL query code example doesn’t give the full picture. I also verified and dont see any open issues related to “Pooled Socket is dead”. Can you provide more information so that someone will be able to help !