Mike B's user avatar
Mike B's user avatar
Mike B's user avatar
Mike B
  • Member for 12 years, 11 months
  • Last seen more than a week ago
137 votes
2 answers
409k views

How can I verify if TLS 1.2 is supported on a remote web server from the RHEL/CentOS shell?

114 votes
7 answers
180k views

REJECT vs DROP when using iptables

106 votes
6 answers
112k views

"POSSIBLE BREAK-IN ATTEMPT!" in /var/log/secure — what does this mean?

77 votes
6 answers
108k views

Do SPF Records For Primary Domain apply to subdomains?

29 votes
6 answers
102k views

What causes Scheduled Task error 2147942402?

25 votes
2 answers
73k views

How can I configure netcat (or some other stock linux utility) to listen on a specific port on a secondary IP address?

21 votes
2 answers
29k views

Are two periods allowed in the local-part of an email address?

19 votes
2 answers
30k views

Is it OK to have multiple TXT records for a single domain containing different SPF entries?

19 votes
2 answers
110k views

What is [PSH, ACK] doing during my connection to a global catalog server?

18 votes
2 answers
50k views

How can I search the info column in Wireshark?

15 votes
6 answers
13k views

How can I easily convert HTML special entities from a standard input stream in Linux?

13 votes
3 answers
16k views

What is the difference between "dnl" and "dnl #" in a sendmail.mc file?

12 votes
3 answers
36k views

What exactly do --limit 1/s and --limit-burst mean in iptables rules?

11 votes
3 answers
19k views

Does the presence of a Content-ID header in an email MIME mean that the attachment must be embedded?

10 votes
2 answers
22k views

What exactly is AVAHI?

9 votes
2 answers
9k views

Can I use an SSH tunnel to access a web server that's listening on a different IP/Port on the same server?

9 votes
4 answers
2k views

When is it appropriate / prudent to use chroot?

9 votes
3 answers
4k views

Why does the "free" command and "dmidecode" show different values for RAM?

8 votes
4 answers
4k views

How can I easily confirm in Linux that two separate directories have the exact same contents?

8 votes
3 answers
25k views

Why is ethtool not showing me all the properties for a NIC?

7 votes
1 answer
17k views

How can I tell who/what shutdown my CentOS VPS?

7 votes
1 answer
11k views

How can I confirm if my vmxnet driver is installed on my CentOS server?

7 votes
2 answers
5k views

How can I decrypt STARTTLS communication over SMTP in a packet capture (if I have the private key)?

6 votes
2 answers
2k views

Is there a graceful way to pick up new changes in sendmail?

6 votes
1 answer
3k views

Why is sendmail adding an extra carriage return in headers?

6 votes
2 answers
6k views

Is there a way to completely disable outbound opportunistic TLS support in SendMail?

6 votes
1 answer
1k views

Are there certain specific host file entries that Windows 2008 will ignore for security purposes?

5 votes
5 answers
30k views

How can I monitor memory usage for a windows-based JVM and trigger an alert if it gets too high?

5 votes
3 answers
1k views

With regard to anti-spam practices, what exactly does a typical reverse DNS check look for?

5 votes
1 answer
17k views

How can I retrieve the LDAP server certificate for Windows 2008 and 2003 global catalog servers?

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