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Security
nft --check Is Not the Whole Firewall Reload Test
nft --check accepted the candidate ruleset reproduced for this article and left the active stateless ruleset hash unchanged. That was only the…
KNOWLEDGE, PUT TO WORK
Security And Vulnerability.
Securing data encryption methods, we delve into the strategies and technologies designed to safeguard your online presence and assets. Stay informed, stay secure.
The knowledge library
74 articlesArticles & guides
Security
Verify an SSH Alias with ssh -G Before It Connects
Which server will ssh app-prod actually contact? The answer is not necessarily the last Host block you remember editing. OpenSSH may combine…
Security
An NGINX mTLS Gate Must Reject the Wrong Client CA
Successful admission is the wrong place to stop an NGINX mutual TLS test. The useful proof is the three-outcome contract around that…
Security
Valid sudoers Syntax Can Still Grant Too Much Access
visudo -c can return “parsed OK” for a rule that authorizes more than its reviewer intended. That is not a parser defect.…
Security
Test SMB Signing Before You Require It
SMB signing can be supported on both endpoints and still not be required. That distinction matters because a policy screen that says…
Security
Audit a systemd Service With systemd-analyze security
An OK result from systemd-analyze security is not proof that a daemon is safe, and an EXPOSED result is not proof that…
Security
When DKIM Body Hash Fails, Trace the Post-Signing Change
dkim=fail (body hash did not verify) is not a generic instruction to replace a DNS record. It means the receiver canonicalized the…
Security
Rotate SOPS age Recipients Without Losing Decryption
Changing an age recipient in SOPS is an access migration, not a one-command key swap. A safe rotation keeps the existing identity…
Security
Rotate WordPress Security Salts: Prove What Gets Invalidated
Rotating WordPress security salts has one precise security effect: cookies and nonces created with the old secrets stop validating. That can end…
Security
AIDE File Integrity Monitoring: Build a Baseline You Can Trust
AIDE can tell you that a Linux file changed, but it cannot tell you whether the change was malicious, approved, or already…
Security
Why Email Forwarding Breaks SPF—and What SRS and ARC Actually Fix
Email forwarding creates a second SMTP delivery. The original sender connected to the forwarding provider, then the forwarding provider connected to the…
Security
ACME Says SERVFAIL Looking Up CAA, but No CAA Record Exists
An absent CAA record is valid. A failed CAA lookup is not. When an ACME order reports SERVFAIL looking up CAA, the…
Security
OpenSSH Ignores authorized_keys When Ownership or Modes Fail
A correct public key can sit in the expected authorized_keys file while OpenSSH still rejects it. With StrictModes yes, sshd checks ownership…
Security
Your TLS Certificate Renewed, but the Old One Is Still Live
A successful renewal proves that a certificate authority issued a new certificate and that some file or certificate store changed. It does…
Security
Linux Audit Lost Events Mean the Evidence Is Already Incomplete
When auditctl -s shows a larger lost value than the previous sample, the Linux Audit trail already has a gap. Those discarded…
Security
OpenSSH MaxStartups Drops Connections Before Authentication
kex_exchange_identification: read: Connection reset by peer does not prove an SSH password, key or account problem. When the server log also reports…
Security
cPanel AutoSSL Behind Cloudflare: Trace the DCV Failure
cPanel AutoSSL does not fail “because of Cloudflare” as one indivisible problem. A failed run means one requested hostname could not prove…
Security
Fail2ban Is Banning Your Proxy, Not the Attacker
A Fail2ban ban can look successful while blocking nothing. Behind Cloudflare or another reverse proxy, the web server may receive the proxy…
Security
Rotate SSH Host Keys Without Locking Out VPS Access
Do not overwrite active SSH host-key files in one step. Generate replacement keys under new filenames, load old and new identities together,…
Security
DKIM Key Rotation Needs Two Selectors, Not a DNS Swap
A safe DKIM key rotation is an overlap between two selector names, not an in-place replacement of one DNS value. Publish and…
Security
DNSSEC SERVFAIL: Find the Broken DS, DNSKEY, or RRSIG
SERVFAIL is frustrating because it names a result, not an owner. The fastest useful split is a paired query against the same…
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