Questions tagged [network]

Questions about configuring, troubleshooting or using connections that one device uses to talk to another.

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3 votes
2 answers
3k views

What is local.blackjack from Netstat?

When running netstat I noticed the suspicious name blackjack. I wonder if it's malware. PROMPT> netstat -v Active Internet connections Proto Recv-Q Send-Q Local Address Foreign Address ...
5 votes
1 answer
10k views

Macbook keeps disconnecting from hotspot Wifi, which works well

I've been having this problem for months, and I finally need help. I found other topics on connection problems, but not quite the one I have. When I'm at home I use a Wifi hotspot from my Android ...
1 vote
1 answer
187 views

Adding external wired NAS to Time Capsule

First, I have none of this equipment, so I can't just test it and see ..Yet. I Know I could hack a Time Capsule into a RaidBox via SATA/eSATA connector, But that's not the route I'd like to go. If you ...
0 votes
0 answers
9 views

How can I fix an iCloud mail SMTP 554 5.7.1 Access Denied error?

This on a 15" M2 MBA on MacOS 14.4.1 Just recently I started getting a 554 5.7.1 SMTP error when sending iCloud mail. The Connection Doctor log says: READ Mar 26 04:50:47.891 [...
3 votes
1 answer
993 views

Is there a single USB wifi adapter/dongle which works on Ventura?

I'm struggling to shop for USB-based Wireless hardware to work with macOS. I ordered and sent back 2 USB dongles because they were mislabeled as compatible but don't want to list them here. The ...
1 vote
1 answer
21 views

macOS 14.4 Seems to Break stable IPv6 'autoconf secured' address

Recently there is instability in macOS reliably generating stable 'autoconf secured' IPv6 address upon reboot. Mine is a stateless IPv6 environment. This seems to be correlated with update to 14.4 (...
1 vote
3 answers
144 views

Interpreting networkQuality JSON output

If you run networkQuality -c you get a nice JSON output suitable for later processing. The problem I have is that I can speculate but I am not sure about what every key and the unit for its value is ...
2 votes
1 answer
166 views

sstp vpn on MacOS Sonoma - could not complete write of frame, could not forward packet to pppd

I'm a little green in this type of things, but I was trying to connect vpn through home-brew to my University vpn, because they state it's the only option on Mac. I use this command: sudo /opt/...
7 votes
1 answer
2k views

Improving NFS client performance

I have my Macbook Pro (MacOS Mojave) connecting to an NFS share on a Linux machine directly connected via Thunderbolt with jumbo frames. Testing with iperf3, I can do ~14 Gbps (~1.8 GBps) over the ...
0 votes
1 answer
28 views

Errant behavior in distribution of '.DS_Store' files

I am currently using macOS Ventura. According to "About this Mac", I am using ver. 13.6.5. Like some of you, I also employ a NAS (network file server+) for backups and general file storage. ...
1 vote
3 answers
50k views

How can I remove a "shared" drive from my Mac?

How can I remove a "shared" drive from Finder left bar (and my Mac mini late 2012 computer) under macOS Sierra 10.12.6? I've tried all the suggestions I can find online, but nothing seems to work. ...
1 vote
1 answer
82 views

Do iOS and iPadOS alert you if the certificate of a network you’re joining has changed

So if you joined a network in the past and trusted its certificate while at it, and saved it on your iPhone/iPad. Sometime later, if either: It’s the same network but their previous certificate has ...
0 votes
0 answers
12 views

Mac OS cannot reach other IPs in local network

My macbook pro was not able to reach internet at my home wifi network. I realized DNS on wifi router IP was not responding. When I set 1.1.1.1 as DNS IP then it was working. After I found out my ...
2 votes
1 answer
2k views

Only Transmission traffic through VPN

I would like to use my favourite torrent client, Transmission, over a VPN service but at the same time I do not want to direct any other traffic therethrough. That is, I want to use my VPN service ...
0 votes
1 answer
56 views

Bandwidth throttling / simulation for selected host

I can control the network for the whole device with Network Link Conditioner but is there a way to do it just for selected hosts? I know that with /etc/hosts I can totally block connection to a host, ...
0 votes
1 answer
1k views

Wifi packet loss problem with Mac

(MacBook pro 16" 2019 big sur [latest]) I have a problem with my wifi. I noticed that my browser gets "stuck" by not loading pages, or taking too long doing that (any browser). I tested ...
3 votes
1 answer
254 views

Is APFS more reliable than HFS+ for a network (sparse bundle) drive?

I do Time Machine backups from my laptop to an SMB network drive. No doubt this is inherently unreliable because mounting a disk image over a network connection can result in the disk needing repair ...
1 vote
0 answers
26 views

what are the CriticalDomains in com.apple.networkextension.control.plist

I use Little Snitch found my system automatically tries to connect to the Google public servers 8.8.8.8 and 8.8.4.4 (I haven't set it). I tried to figure out why. Then I found that after I deleted the ...
9 votes
3 answers
10k views

Screen Time Passcode: Use Password rather than 4-digit PIN?

iOS uses a a 4-digit passcode to secure Screen Time settings (formerly known as Restrictions). Use Screen Time Passcode Use a passcode to secure Screen Time settings, and to allow for more time when ...
1 vote
1 answer
140 views

How do I enable Proxy Configuration File for VPN on Mac Terminal?

I'm using a Mac, I have the corporate VPN turned on (Cisco AnyConnect Secure Mobility Client) In the Proxies tab of System Preferences I have "Proxy Configuration File" enabled with the URL (...
1 vote
1 answer
35 views

MBP M2 regularly loses network connection

I have a M2 MBP which Im having some issues with. Under normal operation, it will connect to a wifi network with no issues - DHCP will assign an IP, DNS and router. Every now and then, it suddenly ...
1 vote
0 answers
83 views

2019 Mac Pro 10GB Ethernet limited to 1.10GBytes Transfer, 944MBits/sec bandwidth

I have a 2019 Mac Pro (Sonoma 14.2.1) that is plugged into a 10GB ethernet switch. The other end is also plugged into a 10GB switch. No matter which direction, iPerf3 is reporting that I'm only ...
5 votes
3 answers
11k views

Internet connection issues on a new 2023 MacBook Pro

Bought a brand-new 2023 MacBook Pro 14 inch running Ventura 13.2 (updated from 13). It intermittently disconnects from the internet. The issue manifests in one of two ways: either there's an ...
1 vote
0 answers
23 views

routing between MacOS Sonoma interfaces

MacBook Air M2 Sonoma 14.4 After a couple of days trying different solutions I've read, time to ask here. Have a RPi 4 connected to MacBook through USB Ethernet adapter en5. Uses DHCPCD, but fails ...
0 votes
1 answer
69 views

Safari http site keep loading forever

I found that http sites (e.g., http://eu.httpbin.org/) keep loading forever, which I did not visit before. Safari does not switch it to the HTTPS. Rather, it keeps loading forever; do you have any ...
0 votes
1 answer
92 views

How to stop DNS spoofing warnings when I change boot media

I am using my Mac as the base workstation to program for a Raspberry Pi project. I use SSH as the primary tool to communicate with and work on the Pi. In the process of experimenting and trying out ...
0 votes
1 answer
1k views

M1 Panic: acc_cifl2c_cmd_ncwr

M1 MacBook Pro 13" 16GB constantly reboots with the same panic error: acc_cifl2c_cmd_ncwr I've spent some time figuring out who is causing this problem. It happens only if M1 MacBook Pro connects ...
0 votes
1 answer
134 views

Can I use pf to route incoming incoming traffic on a specific port differently?

I have a mac that's connected to a VPN, where the VPN's gateway is the system's default gateway for all outgoing traffic. This means that I cannot connect to any services running on my mac from some ...
0 votes
1 answer
98 views

How did my hostname change? Where can I see this change being made/what time it changed?

today I logged into my mac and opened zsh and had a big shock! Normally my terminal prompt is something like: sidharthghoshal@macbook-pro But today I found it was : sidharthghoshal@HaeLims-Air I don't ...
0 votes
1 answer
599 views

"Share Disk" MacBook doesn't appear in "Network" section of the other Mac

One of my laptops (MacBook pro with apple silicon) went kaput recently, and I'm trying to back up the files before I reinstall the OS. I can get it to enter disk sharing mode, but I can't get it to ...
0 votes
0 answers
29 views

Throughput between MacOS and Windows devices limited to 100Mbps, how do I remove the bottleneck?

I am using an M1 MacBook Air on the latest OS Update and a Windows 11 desktop PC and I would like to move files between them in the realm of a couple of GiB (1-100, so transfer speeds do matter). They ...
0 votes
1 answer
3k views

Cannot ping IPv4 address, but IPv6 ping works

I have a Macbook and an Android device (Oneplus phone) on same network and the Macbook connects via USB LAN (or Wi-Fi), Android device via Wi-Fi. I detected the following anomaly: I can ping the ...
4 votes
2 answers
215 views

MacBook Air connects to WiFi but does not load webpages etc

For the life of me I cannot resolve this issue. I was given a 2013 MacBook Air and upgraded it to Big Sur using my work’s WiFi. At home it will connect only to the 5GHz network (it will not connect to ...
0 votes
1 answer
112 views

Howto remove an imported Network Configuration profile from MacOS 10.15.7 without using GUI?

In order to get a useful DNS over TLS server configuration on macOS, I imported a network profile. After having installed this network configuration file, I did not see any new entry in the Network ...
3 votes
2 answers
2k views

Creating a network larger than 200 IPs

I'm using several AirPort Extremes to create a wireless network for a large amount of devices. One AirPort is advertised to support 50 devices, so I'm using 4 AirPorts currently for 200 devices. My ...
2 votes
1 answer
83 views

How to safely copy data from Mac to Windows, preferably over network?

I am wondering what the most reliable method is to copy a large amount (1TB) of photos from a Mac computer (external HFS+ drive) to a Windows computer (external NTFS drive)? I am hoping to do this ...
0 votes
1 answer
387 views

How can I connect my macOS to docker network minikube?

I run the minikube on my macos, and minikube container use the minikube network, check below: $ docker network ls NETWORK ID NAME DRIVER SCOPE 906776761e62 bridge bridge local ...
2 votes
2 answers
193 views

Macos not searching Ubuntu file share

I have a ubuntu server 22.04 setup and it is sharing files using samba. The mac computer can connect to it and use the files just fine. My problem comes in when i try and search for a file or folder ...
15 votes
2 answers
39k views

Command Line (CLI) Command for disconnecting wifi from current network

I'm looking for a way to disconnect from my current WIFI network via CLI. There is a way to do that, but it's a GUI way. Any ideas how to accomplish that? Thanks! Note: I don't want to disable Wi-...
1 vote
1 answer
295 views

Very slow to establish a TCP connection with the router

I am using macOS 11.4 and padavan firmware on the router. It's quite slow (a few to tens of seconds) when I connect to the router's admin page from macOS, and tcpdump showed that a lot of tcp ...
1 vote
0 answers
35 views

How to send and receive UDP multicast data on the same machine?

I cannot seem to receive multicast data I that send with tcpreplay(-edit), on the same Mac. This works fine on Linux using the loopback device. On Mac, not even tcpdump sees the multicast data when ...
0 votes
1 answer
2k views

How to open a port on MacOS Big Sur?

I am trying to open a specific port (8000) on my Mac (macOS 11.6) for local web development testing. Let’s say my computer’s NAT IP is 192.168.1.10. If I go to 192.168.1.10:8000, I get nothing. nmap ...
0 votes
1 answer
47 views

Macbook pro mid 2012 won't connect to a specific wifi network

We just got fibre optic (I'm in the UK, using hyperoptic) so have a new wifi router/network. Every other device except my macbook pro has successfully connected to the wifi. It still connects to the ...
10 votes
1 answer
6k views

How to force-restart OS X networking?

There's a coffee shop network I connect to fairly often. Usually it works fine, but sometimes it gets into a state where the connection repeatedly fails about thirty seconds after connecting. Once ...
0 votes
1 answer
298 views

Mobile network problem on iOS 15.6.1: can't downgrade

After updating to iOS 15.6.1 I have mobile data problems: Sometimes the network is unreachable Sometimes the network is slow Sometimes 4G is unavailable and only 2.5G is available It's just ...
1 vote
1 answer
322 views

Tagged VLAN traffic goes only one way between mac and Linux

I used to have a Mac Mini 2018 with 10Gpbs ethernet connected to my 10Gbps switch. I had a tagged vlan to access my NAS. It worked very well last time I checked. I don't remember when I actually ...
3 votes
1 answer
488 views

Why does my M2 MacBook Pro WiFI TX rate fluctuate from 1200 to 286 Mbps?

I recently purchased an M2 MacBook Pro and the first thing I noticed was that my WI-FI transfer rate consistently alternates between 1200 Mbps and 286 Mbps. This happens every 30 - 90 seconds. No ...
3 votes
1 answer
296 views

Exclamation Mark in the Expire column

I have a VPN issue and I believe it's just routing, but I've notice that there's an exclamation mark in the expire column on a netstat -nr command: Destination Gateway Flags ...
0 votes
1 answer
112 views

Change WiFi channel from 11 to 108

My friend and I use our MacBooks from a local coffee shop sitting at the same table. My Wifi connection is much worse than hers is. Using option + click on the 🛜 menu, which reveals network ...
4 votes
1 answer
6k views

How can I combine internet from two sources on my macbook and get increased speed?

I have two sources of internet, I want to combine both the internet sources and get increased speed. I have noticed by testing, I can either use Ethernet internet or the Wifi Internet at one time, ...

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