Latest Server related questions

Score: 1
Exchange 365 Spam Filter Policy Block Domain TLD
hk flag

We migrated to cloud from on premise Exchange 2010. In Sonicwall ESA, I was able to block TLDs (Top Level Domains). In the Exchange Admin Center, I see I can set individual or additional "Rules", however, no option I can see to test TLD against a dictionary to block the domain. In the Microsoft 365 Security Center, under Policies > Anti-Spam > (new policy), it appears I can edit "Allowed and block ...

Score: 0
Louis Matthijssen avatar
Can't reach Docker container from other Docker container through host IP
sh flag

I got a server running a Wireguard VPN on 10.0.1.254/24 and Docker is running on 172.17.0.1/16.

My docker-compose.yaml looks like this (simplified):

services:
  container_a:
    image: nginx:latest
    ports:
      - '10.0.1.254:80:80'

  container_b:
    image: alpine:latest

Now, I can reach nginx using wget http://10.0.1.254 on the host. I can also reach it the same way from a VPN peer (e.g. 10 ...

Score: 0
HAProxy with same request sometimes responding with NOSRV while backend is up
tr flag

Im making the same request(POST /user/oauth) to haproxy but sometimes i get 503, sending requests directly to the backend always works

here is the logs:

  1. local_server~ app/s2 0/0/0/100/100 200 813 - - --VN 1/1/0/0/0 0/0 "POST /user/oauth HTTP/1.1"
  2. local_server~ app/s1 0/0/1/107/108 200 820 - - --NI 1/1/0/0/0 0/0 "POST /user/oauth HTTP/1.1"
  3. local_server~ app/NOSRV 0/-1/-1/-1/0 503 216 - - SCNN 1/1 ...
Score: 0
AnjanaAK avatar
Are the instances in different subnets of same VCN directly accessible by each other in OCI?
cl flag

In Oracle cloud infrastructure, Let's say

I have a VCN with IPv4 CIDR Block: 10.0.0.0/16.

That VCN has a public subnet with IPv4 CIDR Block: 10.0.0.0/24.

If create a private subnet in the same VCN, with IPv4 CIDR Block: 10.0.10.0/24 , Will the instances (VMs) of public subnet be able to directly ping the instances inside the private subnet?

Score: 0
Microsoft Remote Desktop (MacOS) - Certificate trust
ua flag

I've got a Windows RemoteApps setup to access a few applications from home but having some issues connecting from MacOS devices using the Microsoft Remote Desktop app. I initially thought it coincided with a certificate renewal but there's no issues from Windows devices and I'm fairly certain all aspects of the setup (Gateway, Connection broker, session servers) are all using the correct wildcard certif ...

Score: 0
802.1q multicast blocked by Cisco router
cn flag

We are using Cisco Catalyst 1000 switch (C100-16P-2G-L to be precise) and having a trouble of passing tagged multicast from one its port to another. We would like to pass it as it is (tagged), I assume it should be possible but how to configure (we need to pass multicast traffic with vlan id=257)? default configuration definitely doesn't work.

Some additional details related to default configurat ...

Score: 0
catalin avatar
enough memory for downscale ubuntu server?
kz flag

Management decided to downscale prod server.

Current size:   Standard B16ms (16 vcpus, 64 GiB memory)
Desired size:   Standard B8ms  (8 vcpus, 32 GiB memory)

CPU is mostly idle (output is from sar -u)

10:20:01        CPU     %user     %nice   %system   %iowait    %steal     %idle
10:30:01        all     15.46      0.00      4.24      0.19      0.00     80.11
10:40:01        all     17.11      0.0 ...
Score: 0
Best practices for malware scanning on Ubuntu servers in production
us flag

There are multiple malware/rootkit scanning packages for ubuntu such as clamAV, rkhunter etc. I know how to use them manually but for multiple servers in production environment I could not find a solution which scans the servers daily and send report by email only if issues are found.

What is the solution you use for this case and how do you implement it ?

Score: 2
Balázs Horváth avatar
Recommended NUMA nodes per socket on dual AMD Epyc 7643 server with 1TB of RAM
cn flag

What do you suggest to set the NUMA nodes per socket to? It is factory set to NPS1, but I'm not sure if this is the most optimal value. (We use this device for massively multithreaded bioinformatic tasks)

The possible choice is: NPS0 (will attempt to interleave the 2 sockets together) NPS1, NPS2, NP3, NPS4, Auto (OS: Ubuntu 21.10, 5.13.0-40-generic kernel, 8x128 Gb of RAM)

Thanks in advance!

enter image description here

Score: 0
Hamza AZIZ avatar
Resize an OS disk that has a MBR partition - azure linux vm
sn flag

We have a managed OS disk attached to a Linux VM (Ubuntu) that have 64 GB in size, and it's using MBR partition table with azure vm generation 1, now we want to expand the disk space to 128 GB !

From the azure doc I found this article https://docs.microsoft.com/en-us/azure/virtual-machines/linux/resize-os-disk-gpt-partition, but it explains just the case of GPT partition table,

I know, I need to stop t ...

Score: 0
Tan Mientras avatar
Mail is being delivered to /var/mail/*user* instead of Maildir
in flag

We are migrating an old Debian 6 Postfix smarthost/relay server to a new one, just copying the configuration files and environment files to a new Ubuntu 20.04 system.

For some reason, in the new environment, mail is being delivered to /var/mail/user instead of Maildir (/home/vmail/user/Maildir).

Here's the postconf -n output:

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_d ...
Score: 0
Conteinerized Keycloak behind Nginx reverse proxy requests localhost
us flag

Working setup

I have a configuration of

  • external VPS with public IP that has Nginx reverse proxy (A)
  • internal server with Nginx (B)
  • standalone application (not containerized) Keycloak 17.0.1

Which looks like this. I had a domain registrered for that server which is (let's say) auth.example.com

When I go to https://auth.example.com I can see regular keycloak page with link to admin console.

enter image description here

By click ...

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