Latest Server related questions

Score: 0
Working domain with no NS records, how is it possible?
us flag

I was checking a domain on cloudflare.

webroot.bitappii.com

There is no NS records for this domain on whois. Only SOA and A records. How this is possible that a working domain has no NS records.

Whois only shows

webroot.bitappii.com    SOA 1800        kenneth.ns.cloudflare.com dns@cloudflare.com 2038211396 10000 2400 604800 3600
webroot.bitappii.com    A   300     104.26.2.141
webroot.bitappii.com   ...
Score: 0
Why and how is Postfix automatically reading main.cf file?
us flag

today I changed TLS cert paths in Postfix main.cf file. Those paths turned out to be broken.

In a few minutes, Postfix has read those changed paths and my TLS connections became broken (becouse of broken paths).

Question 1: Why Postfix automatically reads changes from main.cf file? Is is documented? I can't find any information about it.

Question 2: Can I turn off this behaviour? I expected Postfix to  ...

Score: 0
Danny Christensen avatar
isc dhcp multiple option 240 in same subnet
cn flag

I'm fairly new to isc dhcp.

I'm working at an ISP and need to provide our STB's with an option 240, and it has worked fine for years, the problem now is that we are getting a newer model, that needs a different option 240 string. How do I do that in the same subnet? Is it possible to match on the mac-address and only provide the correct option 240 string to the corresponding mac.

Best regards Danny

Score: 0
Chris Chan avatar
Certbot renew running but not renewing - 2021
cn flag

I have exactly the same issue as this post 3 years ago. Certbot timer is working, but the cert will not renew every 90 days. I resorted to booting the server and the cert will be updated. I have also shown my certbot system status and certbot.service. Previously, it was mentioned that this could be due to permission, but it is unlikely since the cert is updated upon reboot. What could be the problem her ...

Score: 1
Doji avatar
Spanning tree causing packet loss between a Cisco switch C3560 and Linux server running on CentOs
sv flag

I am working in a network environnement where I have some Cisco Switch WS-C3560X-48 and Linux Servers running CentOS 7.7.

The linux servers are connected 3 times on my switches : one admin link, one production link and one ILO link because they are running on HP hardware.

When I try to ping the servers on the admin LAN from my Cisco switch, I get the following result :

SWTCisco#ping 10.123.213.152 source ...
Score: 0
Atreiide avatar
How to remove escape character when using kafka console consumer?
cn flag

For compliance purposes, I have to save all kafka raw documents and keep them one year. To do this, I use the following :

kafka-console-consumer.sh --bootstrap-server kafka1:9092,kafka2:9092,kafka3:9092 --topic test1 --consumer.config /usr/local/kafka_2.12-2.2.1/config/consumer.properties >> /data/backup.txt

Saved documents have escape characters like this (\ before each double quotes) :

{"type":"F ...
Score: 0
RTD avatar
Creating VMs in other CSP AAD Tenancies from my VM Images in Azure
jp flag
RTD

I am sorry if the question isn't so sharp or accurate but I am new to Azure, so feel free to ask for clarifications if needed.

I want to share a VM Image with other customers outside my organisation and AD. More precisely, we have a reseller relationship with them through CSP and I don't want to manually create the VM there every time, which entails installing and configuring a suite of applicati ...

Score: 0
Mr Zach avatar
dmarc reports and invalid sender ip
br flag

We sometimes get an aggregated report where some mails fails due to invalid ip. That ip is not allowed to send emails from our domain (I guess it is spam. this IP does not belong to us) - is there any recommendation for what to do?

We only use our mail server for sending email.

Should we contact the operator the IP belongs to and notify they have somebody sending spam? Or is there noting to do about ...

Score: 0
Skye-AT avatar
Disabling auto-login via gpedit?
kz flag

Recently, one of our employee has left his computer in the customer's office, which could possibly leak some information from that device(Thankfully, it didn't happened). Right now, all of our computer has enabled auto login, and it's almost a hundred. So, I've been wondering if it's possible to disable it by using Group Policy Editor. Our server is running Windows server 2016.

All of the compute ...

Score: -1
al404IT avatar
How to test DNS change on Mac before go live?
cn flag

I need to test DNS changes before updating real DNS I need to set up A records and CNAME

Any Mac software that let me do it and possibly easily switch ON / OFF?

Score: 0
Francabicon avatar
How can i connect OPNsense router to Mikrotik Switch
in flag

I've encountered this situation where I'm to access the switch from my router: Here is what i have set:

  • Lan (DHCP 192.168.50.1 , DHCPIPV6)
  • WAN (DHCP 192.168.80.1,DHCPIPV6)
  • Mikrotik (DHCP 192.168.80.1,DHCPIPV6) [connected to Mikrotik network switch]
  • VLAN_Mikrotik (DHCP 192.168.81.1, DHCPIPV6)

click on this image to see it

When i type 192.168.88.1 (Mikrotik Default IP) i cannot access it. Because this  ...

Score: 0
BairDev avatar
Allow ajp traffic (Apache -> Tomcat) with iptables
cn flag

Disclaimer: I am not an admin, but a programmer, who did not use iptable that much yet.

I am using mod_jk with AJP13 for directing certain data traffic from Apache to Tomcat. Additionally I am trying to be pretty specific in the firewall rules on the server.

I am talking about localhost -> localhost traffic here, only incoming connections for ports like :443 or :22 should be accepted by the firewal ...

Score: 1
ICT avatar
IPsec site-to-site VPN issues after recent Linux kernel update
ke flag
ICT

Last weekend we had an automatic security upgrade on one of our VPN gateways that connect sites to our cloud environment. After performing troubleshooting (via basic network troubleshooting e.g. via Wireshark) we identified one of the most recent security updates to be the cause of this. We have restored the system back to a known good state and have set (we believe to be) affected packages on hold.

 ...
Score: 14
rgb255_255_255 avatar
Why is mdadm unable to deal with an "almost failed" disk?
gb flag

Multiple times in my career now I've come across mdadm RAID sets (RAID1+0, 5, 6 etc) in various environments (e.g. CentOS/Debian boxes, Synology/QNAP NASes) which appear to be simply unable to handle failing disk. That is a disk that is not totally dead, but has tens of thousands of bad sectors and is simply unable to handle I/O. But, it isnt totally dead, it's still kind of working. The kernel log is t ...

Score: 2
Luigi avatar
Error Hostname DOES NOT VERIFY - Test certificates TLS Exchange 2016 cu21
cn flag

Practicing with the certificates, in let's encrypt win-acme normal is created, I send and receive normal mail, https in owa and the other services

Testing with checktls, it gives me an alert message :

Cert Hostname DOES NOT VERIFY:

(mail.contoso.com != mail | DNS:mail | DNS:mail.lan.contoso.com)

I don't understand the mail.lan.contoso.com DNS error. I thought the error was the DNS SPLIT, but reading i ...

The Stunning Power of Questions

Much of an executive’s workday is spent asking others for information—requesting status updates from a team leader, for example, or questioning a counterpart in a tense negotiation. Yet unlike professionals such as litigators, journalists, and doctors, who are taught how to ask questions as an essential part of their training, few executives think of questioning as a skill that can be honed—or consider how their own answers to questions could make conversations more productive.

That’s a missed opportunity. Questioning is a uniquely powerful tool for unlocking value in organizations: It spurs learning and the exchange of ideas, it fuels innovation and performance improvement, it builds rapport and trust among team members. And it can mitigate business risk by uncovering unforeseen pitfalls and hazards.

For some people, questioning comes easily. Their natural inquisitiveness, emotional intelligence, and ability to read people put the ideal question on the tip of their tongue. But most of us don’t ask enough questions, nor do we pose our inquiries in an optimal way.

The good news is that by asking questions, we naturally improve our emotional intelligence, which in turn makes us better questioners—a virtuous cycle. In this article, we draw on insights from behavioral science research to explore how the way we frame questions and choose to answer our counterparts can influence the outcome of conversations. We offer guidance for choosing the best type, tone, sequence, and framing of questions and for deciding what and how much information to share to reap the most benefit from our interactions, not just for ourselves but for our organizations.