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  1. Troubleshooting Hub
  2. TLS & PKI

TLS & PKI Runbooks

Expired, mismatched, and untrusted certificates causing connection failures.

4 scenarios · search and filter below, or jump via the quick nav.

Foundation2Intermediate1Advanced1
Foundation2 runbooks
TLS certificate expired — clients failing handshakecritical

Clients get 'certificate has expired' or verification error

TLS & PKIFoundation2 causes
1Open runbook
TLS hostname mismatch — certificate doesn't cover the namehigh

'SSL: certificate subject does not match hostname' in clients

TLS & PKIFoundation2 causes
2Open runbook
Intermediate1 runbooks
TLS certificate chain incomplete — intermediate missingmedium

openssl s_client shows 'unable to get local issuer certificate'

TLS & PKIIntermediate2 causes
1Open runbook
Advanced1 runbooks
TLS protocol/cipher mismatch — client and server can't agreemedium

Older clients fail handshake with 'SSL: no protocols available'

TLS & PKIAdvanced2 causes
1Open runbook