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Mastering Development System & Network

Is it a DMARC failure if disposition=none & dkim=fail?

When I get one of these DMARC reports from Google is it because there is a problem? Or is it standard protocol. I am curious because I sent one test email and got this DMARC report to abuse@orcaaccounting.com. I just want to make sure everything is 100% elite with 0 room for any deliver-ability issues […]

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Mastering Development System & Network

sftp errors with connection closed

I’m trying to sftp into an Amazon Linux system w/ a password. I created an account, ‘amitd’, set the password, and I modified /etc/ssh/sshd_config to set ‘PasswordAuthentication yes’ and I bounced sshd. I attempt to login via both ssh and sftp, no problem, everything is looking goog. But, I want this account to be sftp […]

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Mastering Development System & Network

TLS Error: TLS key negotiation failed to occur

I have an OpenVPN server. I have troubles connecting to it. I have followed step by step (a few times) the instructions on How to Set Up an OpenVPN Server on Ubuntu 18.04. However, when I run sudo openvpn –config client1.ovpn I get: Sat Aug 8 21:45:34 2020 OpenVPN 2.4.4 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] […]

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Mastering Development System & Network

How can I “spy” on an Apache web server’s response to server-side code like PHP or JavaScript?

I’m trying to debug a problem with a file upload strategy and don’t know whether there’s an issue with directory permissions / ownership or the scripts. … I’ve tried both PHP and JavaScript and can’t seem to get enough information to track down what’s happening, despite tail -f on both the error and access logs […]

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Mastering Development System & Network

Backup files from FreeIPA client to a domain server using cron script

I have machines running RHEL8 on an IPA domain (application servers and one storage server). The application servers run Postgres docker containers with database data stored on the host application server. I’m trying to create a system for automated backup of database data on these application servers to a single remote storage server. I can […]

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Mastering Development System & Network

How to clear ZFS DEGRADED status in repaired pool

I got my first drive failure after a couple of years of maintaining this zpool so I did a zpool replace the drive with one of my spares. It took 60 hours (as shown below) to resilver the array but it seems to have done it with zero errors. The problem is that it is […]

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Mastering Development System & Network

NGINX reverse proxy multiple domains error

I have NGINX running as a reverse proxy, with multiple domains and multiple hosts. Example1.com, www.example1.com and example2.com all work fine together. If www.example2.com gets thrown into the mix (with any or all of the other ones) NGINX throws an error when I try to start it. It does work fine on it’s own, and […]

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Mastering Development System & Network

is there a way to run doveadm expunge with exception?

is there a way to run this doveadm command but with exception to not delete the FLAGGED email? doveadm expunge -u email@ccount mailbox Inbox SENTBEFORE 90d

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Mastering Development System & Network

Why apple is sending traffic on port 0 to my network?

I am curious to know if anyone can help why apple.com is sending traffic to my network on port 0? The traffic source IP looks to belong to apple according to (https://www.abuseipdb.com/check/17.33.9.1 and https://talosintelligence.com/reputation_center/lookup?search=17.33.9.1) and hashed out is the destination IP, my IP. Both source and destination ports are 0. I was not able to […]

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Mastering Development System & Network

How can I use different ssh keys for user1@host and user2@host, without resorting to aliased hostnames?

I have a remote CentOS server, lets pretend it’s called hostname.com hostname.com has several user accounts, and I want to ssh into this server as any one of these users (using ssh keys rather than password). It seems everyone recommends just changing my local ssh config, add an alias the server for each remote user, […]