The ramblings of a computer geek
Was getting the problem that mails were being delayed from Exchange when sending outbound via a Postfix SMTP relay. After much work to try to determine the issue, I discovered that the Postfix server was responding with 400 errors for domains that did not exist or for domains that didn’t even have MX records. I … Read more
Explainations of the Windows 4GB Limit, PAE, AWE and Large Page Support
The increasing use of the Internet is driving the use of ADSL among businesses and homes, more and more people are getting hooked up and using ADSL and the Internet in new and exciting ways, running more services and using their internet connection to links networks through VPN and running their own web servers. Getting … Read more
At least once a year in the UK on a Bank Holiday the film WarGames is shown, possibly the best film about computer hackers ever made, as the inspiration for films such as Hackers, Swordfish, Sneakers, The Net and others. The computers and technology in it may be dated but its still an excellent sci-fi … Read more
Visual Basic is a more complex and updated version of an old programming language known as BASIC. BASIC stands for Beginners All Purpose Symbolic Instruction Code. BASIC became popular as a simple high-level programming language due to its simplicity and its ease to learn, that why most people now probably learnt to program with BASIC. … Read more
Email is a tricky thing to do right, though a couple of simple tools can help you test your mail server before you start to use it, i.e. make sure mail can be delivered correctly to a users mailbox. Also it can help diagnosing certain problems that you might have with your email. POP – … Read more
On our Cisco 4500 series switches we could not see when ports where going up or down, even when using “terminal monitor.” We use this technique to identify ports and has been useful in our VLAN project. The problem was that on 4500 series switches, you need to manually enable this type of logging, to … Read more
Setting up a second exchange server in the same routing group, all installed fine, however, after moving a mailbox to the new server and then sending an email to the mailbox, the mail got stuck in the queue on the first server. Checked the common things like DNS, firewall ports etc. all looked fine. But … Read more
You can find a duplicate email address, by using Active Directory Users and Computers, then following this procedure: To search for a duplicate address do the following: Open Active Directory Users and Computers. Right click on your domain name and click on the “find” option. Then choose “custom search”. Then click on the “Advanced” tab. … Read more
I came into work this morning to a downed Exchange storage group and mail store. In the event log just after the backup ran i saw these string of events in the event log on the Exchange server. <em>Event Type: Error Event Source: ESE Event Category: General Event ID: 482 Date: 27/10/2010 Time: 21:00:34 User: … Read more