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curle_ldap_cannot_bind
Easy Fix
cURL · libcurl & CLI
libcurl code CURLE_LDAP_CANNOT_BIND indicates ldap cannot bind during protocol-specific command exchange.
Quick Answer
Error code CURLE_LDAP_CANNOT_BIND on your cURL libcurl & CLI means: libcurl code CURLE_LDAP_CANNOT_BIND indicates ldap cannot bind during protocol-specific command exchange.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
  1. CURLE_LDAP_CANNOT_BIND was returned while libcurl handled a request stage related to protocol-specific command exchange.
  2. Command options, endpoint behavior, or intermediary network components are incompatible with expected transfer flow.
  3. Runtime environment specifics (proxy, cert store, protocol support, or callback behavior) contributed to CURLE_LDAP_CANNOT_BIND.
How to Fix It
1
Capture verbose output (-v / --trace) and isolate the exact phase where CURLE_LDAP_CANNOT_BIND appears.
2
Reproduce ldap_cannot_bind with a minimal request against a known-good endpoint.
3
Validate protocol, TLS, DNS, proxy, and timeout options tied to protocol-specific command exchange.
4
Adjust one option at a time until CURLE_LDAP_CANNOT_BIND clears and transfer completes successfully.
5
Lock the fix into scripts/clients and monitor for CURLE_LDAP_CANNOT_BIND regression.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
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