Technology Services

Author: doachs

  • Mailserver Downtime

    —

    by

    doachs

    At about 8:30pm tonight, our IMAP and POP server died. As a result webmail and any other email client was unable to login and read messages. During this time our mailservers dutifuly stored the mail until just before 9:00pm when the IMAP and POP server was restored.

  • Firefox 1.5 and Javascript

    —

    by

    doachs

    Not sure if anyone else has noticed this or not, but there are a few websites out there that cause my cpu usage to max out. I first noticed it shortly after installing Firefox 1.5 and visiting any oreillynet.com website. It appears as thought it is caused by something in the sites javascript because disabling…

  • This Weeks Status Update

    —

    by

    doachs

    Microsoft WMF Vulnerability: Obviously the big story this week was the Windows WMF vulnerability. I think we caught this one early, told people how to avoid infection, and now with the Windows patch being available, are fairly safe. I am still worried that a lot of computers were silently infected with some spyware, but chances…

  • Greylisting Effective Against WMF

    —

    by

    doachs

    So far so good on the WMF vulnerability. I have not yet seen any evidence of any computer on campus being infected via this route. One thing I just noticed this morning after reading the F-Secure Blog and searching our logs for robert@yale.edu, is that our greylisting software is working to combat this particular message.…

  • WMF Vulnerability

    —

    by

    doachs

    As everyone should know by now, there is a major security threat out there exploiting the WMF vulnerability. For now we are trying to watch the situation closely, and get the appropriate info out there to those who need it. As a precaution, based on info from http://isc.sans.org/diary.php we are blocking the following networks at…

  • This weeks update

    —

    by

    doachs

    Well, we got a lot of things done this week since it was so quiet. At times we were a little too brave and broke a few things when we should not have, but in the end a lot was accomplished. Reducing duplicate email messages – We put in place a procmail script that checks…

  • Postifx and Authentication

    —

    by

    doachs

    After updating one of our 2 postfix mailservers we discovered that some email clients can’t deal with all the authentication options our mailserver presents to them. For example Eudora has an issue if postfix says it can do CRAM-MD5 as in the following example: 250-AUTH PLAIN DIGEST-MD5 LOGIN CRAM-MD5 250-AUTH=PLAIN DIGEST-MD5 LOGIN CRAM-MD5 For some…

  • Heartbeat on Fedora Core 4

    —

    by

    doachs

    Here are the steps I took to get heartbeat ( from linux-ha ) to run on Fedora Core 4 (fc4). It is by no means a clean install, but it appears to work for us at the moment. First download the RPM’s from http://www.ultramonkey.org/download/heartbeat/. I am using version 2.0.2 today. Then I installed curl to…

  • Friday Maintenance

    —

    by

    doachs

    For the past few weeks the load on our email servers, specifically the ones responsible for imap/pop/webmail, have been unable to keep up with the increasing demand. Thus causing access to imap/pop/webmail to be unavailable during times of peek usage. Delivery of email was not affected. To help alleviate the issue, we have spent the…

  • Friday’s Upgrades

    —

    by

    doachs

    Every day it seems like we are sending and recieving more and more email. That means every day our email system is more and more loaded. A couple of weeks ago we hit the limit as to how much email our disks could handle for everyone’s inboxes. We store all the users inboxes on a…