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Loop for SMTP Reverse Banner Check DNS Resolution

Common errors:

 Loop detected! We were referred back to

 Too many delegations to other servers. Probably a loop.



 Verify that your reverse DNS is setup properly.

 Verify that your IP provider has given you full IP delegation. (in some instances you need to specify that you want full reverse delegation as some providers will still route through their own DNS first causing errors for some reverse DNS methods.)



Using a SSL Certificate for RDP

Create and install a certificate using IIS or import a pfx file, the cert can be SHA256 or whatever you want.

Open your Cert Manager,

  • Run/open "MMC"
  • File, Add/Remove Snap-in, Certificates, OK
  • Expand the folder with your cert (generally Personal, Certificates)
  • Right Click the Certificate, Open
  • Details tab, near the bottom choose thumbprint and select the HASH VALUE
  • remove the spaces from the HASHVALUE
  • open a Command Prompt with elevated privileges
  • run the following command using your SSL cert's thumbprint hash value in place of "HASHVALUE" remove the quotes.
    • wmic /namespace:\\root\cimv2\TerminalServices PATH Win32_TSGeneralSetting Set SSLCertificateSHA1Hash="HASHVALUE"
  • It should say "Updating property(s) of ...
  • then it should say .. update successful

That's it, you're done.

Extract Internet Headers from Outlook 2010+

Simple instructions for obtaining the internet headers using outlook 2010 and above.

  1. Double click the email in question, it should open in a new outlook window.
  2. Choose "File" 
  3. Choose "Properties"
  4. Select all of the content in the section at the bottom of the popup window labeled "Internet Headers".
  5. Copy and paste that into a text window to see the full header.

Can't Access Self-Signed SSL Certificate in Internet Explorer 7 8 9, Clicking "Continue to this website" redirects to "res://ieframe.dll/"

To fix this problem simply add "about:internet" to your trusted sites using the following steps

  1. Click "tools" > "Internet Options" > "Security" tab
  2. Select "Trusted Sites" then "Sites"
  3. Now enter "about:internet" then click "add"
  4. click "close" then "OK"

Finished, you should now be able to access that peskly self signed SSL certificate.

Be careful, this can open you to potential fake site exploits.

Installing webmin on CentOS6.3 using the CentOS-6.3-x86_64-minimal.iso image

Run the following commands:

# cat > /etc/yum.repos.d/webmin.repo << EOF
name=Webmin Distribution Neutral

Now run

# rpm --import http://www.webmin.com/jcameron-key.asc

Check for updates prior to installing webmin

# yum update

Install webmin

# yum install webmin

Now open port 10000 to access webmin, to open for all IP's for example

# iptables -I INPUT -p tcp --dport 10000 -j ACCEPT

# service iptables save

Be sure to lock down the webmin & port 10000 to spacific IP's for best security and to configure SSL as per comments below you will need to install SSL then enable it from the webmin GUI

# yum install perl-Net-SSLeay