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Data structures and algorithms resources

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February 29, 2020

My favorite free courses to learn data structures and algorithms in depth

Cracking the Coding Interview: 150 Programming Questions and Solutions

Programming Interviews For Dummies

5 Free Data Structure and Algorithms Books in Java Programming

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How to fix Cisco Anyconnect Cookies must be enabled to log in.

April 02, 2021

Cookies must be enabled to log in. Description Message originated from the Cisco ASA. In order to log into the secure gateway, cookies must be enabled. The secure gateway detects that it is unable to correctly set a cookie. Solution Add the domain to the browser list of trusted sites.

Serve images in next-gen formats

July 04, 2020

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more .

Education resources

March 30, 2020

National Geographic Kids Science Lab - Science experiments, videos and articles National Ocean Service (NOAA) Kids - Science activities and resources for kids and educators Lunch Doodles with Mo Willems! - Kennedy Center Education Artist-in-Residence Mo Willems explore ways of writing and making with kids of all ages Scholastic Learn-At-Home Resources - Learning experiences for K-9 Greg Tang Math - Math games and resources for all ages SciShow Kids - Videos explaining scientific concepts for young, curious minds Frontiers for Young Minds - Science articles written by scientists and reviewed by kids The Kid Should See This - STEAM, history, and culture-focused videos for kids of all ages Imagineering in a Box - Lessons on theme park design and engineering via Walt Disney Imagineering, Pixar and Khan Academy BBC Bitesize - Lessons covering math, English, science and more for ages 3-16+ BrainPop - Learning tools covering a variety of subjects BreakoutEDU - Immersive learning g

PowerMTA sample virtual PMTA config file

January 04, 2020

Sample PowerMTA virtual PMTA config file # # E-mail address for mailer's administrator (please specify!) # postmaster admin@mydomain.com domain-key my-domain,*,/etc/dkim.key # # Settings per source IP address (for incoming SMTP connections) # < source 127.0.0.1> always-allow-relaying yes # allow feeding from 127.0.0.1 process-x-virtual-mta yes # allow selection of a virtual MTA max-message-size 0 # 0 implies no cap, in bytes smtp-service yes # allow SMTP service allow-mailmerge yes </ source > < source 23.45.67.89> # phplist or oempro installed always-allow-relaying yes # allow feeding from mailer.mydomain.com process-x-virtual-mta yes # allow selection of a virtual MTA max-message-size 0 # 0 implies no cap, in bytes smtp-service yes # allow SMTP service hide-message-source true remove-header Received allow-mailmerge yes </ source > < source 12.23.

Fixed Windows warning: agent returned different signature type ssh-rsa (expected rsa-sha2-512)

May 02, 2020

On windows: Run ssh-agent.exe ssh-add ssh And you get the warning: warning: agent returned different signature type ssh-rsa (expected rsa-sha2-512) It is because ssh-agent on Windows is using an older signing algorithm that your sever is rejecting. The issue is with ssh-agent version on Windows To fix: Download the latest release from here and substitute the "install-sshd.ps1" script for this one . Then run the replaced "install-sshd.ps1".

How to install/renew SSL Certificate for Glassfish

March 19, 2021

From certificate authority, you should generally receive two files Your signed certificate : generally named as “yourdomain.com.crt” Root certificate of your certificate (you might receive more than one. In some cases certification authority sends the intermediate certificates) : Godaddy names it “gd_bundle-g2-g1.crt” Next step is importing the keystore you used to generate the request into the Glassfish’s keystore: keytool -importkeystore -srckeystore /your-former-used-for-request/keystore.jks -destkeystore $GLASSFISHHOME/domains/yourdomain/config/keystore.jks Now, the final step done on keystore is importing the signed certificate. First, we gotta switch to Glassfish’s keystore and import the root certificate: cd $GLASSFISH_HOME/domains/yourdomain/config keytool -import -v -trustcacerts -alias root -file gd_bundle-g2-g1.crt -keystore keystore.jks -keypass changeit -storepass changeit Then, import the signed certificate of yours: keytool -import -v -trustcacerts -alias

PowerMTA pmta command

August 15, 2019

Usage: pmta [options] command where 'options' are: --help display this message --xml display result in XML --dom display result as DOM-like "variables" and where 'command' is one of: clear dnscache domainname check mfrom [--tcp] [--dumppackets] mfrom ip check spf [--tcp] [--dumppackets] ip heloDomain [mailFrom] delete [--dsn] [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--older-than=time-interval] [--no-accounting] deregister [--user=name] [--local-only] [--retain-unloaded] disable source [--reenable-after=interval] ip domain[/vmta] enable source ip domain[/vmta] list [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--maxitems=n] [--older-than=time-interval] [--pause] [--priority] [--schedule] pause queue domain[/vmta] pause job jobid register [--user=name] [--label=name] [--webmon-ip=ip] [--webm

How to delete / clear queue of PowerMTA

September 08, 2020

To delete / clear queue of PowerMTA: Use pmta delete Syntax : pmta delete [–dsn] [–queue=domain[/vmta] [–orig=addr] [–rcpt=addr] [–jobId=id] [–envId=id] [–accounting] Description : Deletes recipients from the queue. Although “–queue”‘s default is */*, the command requires either –queue or –jobId to be entered explicitly, so that an accidental “pmta delete” command doesn’t delete the entire queue. Messages are marked in the accounting file as deleted by administrator. Options : –dsn specifies that a DSN report should be sent. Using this option may slow the deletion process. No entry is written to the accounting file unless the –accounting flag is used as well. –accounting specifies that deletion information should be written to the accounting file. Using this option may slow the deletion process. –queue specifies which queue(s) to delete from, and defaults to all queues. –orig specifies that only recipients with the MAIL FROM address be deleted –rcpt specifies that only recipients wit

How to mount AWS FSx in /etc/fstab

July 04, 2020

Example: fs-09accab1db95b56a6.fsx.us-east-1.amazonaws.com@tcp:/6omu7bmv /mnt lustre defaults,_netdev,noatime,flock 0 0 Mounting FSx using /etc/fstab: https://github.com/awsdocs/amazon-fsx-lustre-user-guide/blob/master/doc_source/mount-fs-auto-mount-onreboot.md In summary, we can use the layout "file_system_dns_name@tcp:/mountname /mnt/fsx lustre defaults,noatime,flock,_netdev 0 0" to add our FSx resource to our fstab file, and ensure that it mounts correctly using mount -a.

Fix-Dell iDRAC error: RAC0218: The maximum number of user sessions is reached

April 02, 2021

You can still ssh to your iDrac, after login, Run the command: racadm racreset If you can access the server physically: Hold in the “I” on the front of the server (near the power button) for about 20 seconds it will force a reset of the iDRAC. You’ll hear the fans speed up during this process but after a few mins you’ll be able to remotely access your iDRAC again.

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Data structures and algorithms resources

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