https://bugzilla.mindrot.org/show_bug.cgi?id=2545
Bug ID: 2545
Summary: reverse DNS lookups shouldn't block login
Product: Portable OpenSSH
Version: 6.6p1
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5
Component: sshd
Assignee: [email protected]
Reporter: [email protected]
sshd currently blocks on doing a reverse DNS lookup during login when
UseDNS is yes. this normally doesn't present a problem, but broken or
misconfigured resolvers and servers can cause a 20-second penalty to
sshd users.
sshd should do the name resolution in a non-blocking way.
see https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/424371
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