Aplicatii specifice

Instalare/reinstalare aplicatii default(Office, PDF reader) 11 Solutii

Instalare/Reinstalare aplicatii predefinite (ex. Office, PDF reader) 44 Solutii

Instalare/reinstalare aplicatii la cererea clientului 26 Solutii

Instalare/Dezinstalare aplicatii cerute de client (Viewer .p7m - caiet de sarcini, Autocad) 23 Solutii

Configurare browser 144 Solutii

Configurare program 2538 Solutii

Depanare Office 72 Solutii

Depanare alte aplicatii 40 Solutii

Microsoft Teams nu functioneaza cu VPN

Una dintre cele mai frecvente situatii intalnite in mediile de lucru cu acces VPN este disfunctionalitatea aplicatiei Microsoft Teams. Simptomele pot varia: imposibilitatea de a trimite mesaje, apeluri audio/video care nu se initializeaza, erori de retea persistente sau deconectari repetate – si asta in ciuda faptului ca internetul functioneaza aparent normal. Cauzele sunt de cele mai multe ori legate de modul in care VPN-ul gestioneaza traficul de retea, protocoalele folosite sau configuratia DNS.

1. Dezactiveaza conflictele de rutare a locatiei VPN

Cand te conectezi la un server VPN dintr-o tara diferita de cea in care te afli fizic, sistemul de securitate Microsoft poate interpreta acest lucru ca o activitate neobisnuita si poate bloca partial sau total accesul la serviciile Microsoft 365, inclusiv Teams.

Cum identifici problema:

  • Deconecteaza-te de la VPN si testeaza Teams timp de 2-3 minute.
  • Daca Teams functioneaza perfect fara VPN, inseamna ca problema este cauzata de locatia serverului VPN ales.

Cum rezolvi:

  • Deschide clientul VPN si acceseaza meniul de selectie a serverelor.
  • In loc de optiunile automate (“Fastest Server”, “Auto”), alege manual un server cat mai apropiat geografic de locatia ta actuala.
  • Daca esti intr-un mediu corporativ, intreaba echipa IT daca exista un gateway regional specific pe care trebuie sa-l folosesti.

2. Schimba protocolul VPN pentru a suporta UDP

Microsoft Teams transmite traficul audio si video prin protocolul UDP (User Datagram Protocol), deoarece prioritizeaza viteza si latenta redusa. Unele configuratii VPN forteaza rutarea intregului trafic prin TCP (Transmission Control Protocol), care include mecanisme suplimentare de verificare a erorilor – ceea ce introduce intarzieri semnificative, mai ales in cadrul apelurilor video.

Pasi de urmat:

  1. Deschide aplicatia clientului VPN.
  2. Navigheza la Setari (Settings) > Protocol sau Tip conexiune (Connection Type).
  3. Schimba protocolul catre IKEv2, IPsec sau WireGuard – toate acestea suporta nativ UDP.
  4. Reconecteaza-te la VPN si initiaza un apel de test in Teams.

Nota: WireGuard este in general cel mai eficient protocol in ceea ce priveste latenta si consumul de resurse, recomandat in special pentru apeluri video de calitate.

3. Goleste cache-ul DNS si configureaza un resolver public

VPN-urile atribuie de obicei propriul server DNS intern. Acesta poate contine inregistrari expirate sau poate esua la rezolvarea corecta a domeniilor Microsoft (de ex. teams.microsoft.com, login.microsoftonline.com). Rezultatul este ca aplicatia nu poate stabili conexiunea cu serverele Microsoft, chiar daca internetul functioneaza.

Pasi de urmat:

  1. Deschide Command Prompt ca Administrator (click dreapta > Run as administrator).
  2. Executa urmatoarele comenzi una cate una:

ipconfig /flushdns

netsh winsock reset

netsh int ip reset

  1. Mergi la Panou de control > Centrul retelelor si partajarii > Modificare setari adaptor.
  2. Click dreapta pe conexiunea VPN > Proprietati > Protocol Internet versiunea 4 (TCP/IPv4) > Proprietati.
  3. Selecteaza “Utilizati urmatoarele adrese de server DNS” si introdu:
  • Google DNS: 8.8.8.8 (preferat) si 8.8.4.4 (alternativ)
  • SAU Cloudflare DNS: 1.1.1.1 (preferat) si 1.0.0.1 (alternativ)
  1. Reporneste calculatorul, reconecteaza VPN-ul si testeaza Teams.

4. Ajusteaza stiva de retea si dimensiunea MTU

Fiecare conexiune VPN adauga un antet suplimentar fiecarui pachet de date transmis (encapsulare). Daca dimensiunea pachetelor depaseste limita maxima de transfer (MTU – Maximum Transmission Unit) a tunelului VPN, acestea sunt fragmentate sau eliminate complet. Acest lucru determina Teams sa expire la conexiune (timeout) sau sa afiseze erori de retea intermitente.

Pasi de urmat:

  1. Deschide Command Prompt ca Administrator.
  2. Reseteaza stiva de retea:

netsh winsock reset

netsh int ip reset

  1. Identifica numele adaptorului VPN cu comanda:

netsh interface ipv4 show subinterfaces

  1. Seteaza o valoare MTU mai mica (inlocuieste “Numele_VPN” cu numele real al adaptorului):

netsh interface ipv4 set subinterface “Numele_VPN” mtu=1400 store=persistent

Daca valoarea 1400 nu rezolva problema, incearca 1350. Reporneste calculatorul dupa fiecare modificare si testeaza Teams.

5. Activeaza Split Tunneling

In configuratia implicita, un VPN roteaza TOT traficul de internet prin reteaua corporativa. Aceasta arhitectura creeaza un blocaj semnificativ pentru aplicatiile in timp real, precum Teams, deoarece pachetele audio si video trebuie sa parcurga drumul dus-intors prin serverele companiei inainte de a ajunge la destinatie – crescand latenta si probabilitatea de pierdere a pachetelor.

Split tunneling este o functie care permite VPN-ului sa “excepteze” anumite tipuri de trafic din tunel. Concret, traficul Microsoft 365 (inclusiv Teams) va circula direct catre internet, in timp ce datele interne ale companiei raman protejate prin VPN.

Avantaje:

  • Latenta redusa – pachetele nu mai fac “turul” prin serverele corporative.
  • Calitate audio/video imbunatatita in apeluri.
  • Livrare instantanee a mesajelor.
  • Traficul intern al companiei ramane securizat si izolat.

Important: Aceasta setare trebuie activata de catre echipa IT sau administratorul de retea. Nu poate fi configurata individual de catre utilizatorul final. Contacteaza departamentul IT si solicita activarea split tunneling pentru traficul Microsoft 365.

  • Solutiile 1, 2, 3 si 4 pot fi aplicate direct de catre utilizator.
  • Solutia 5 (Split Tunneling) necesita interventia echipei IT.

*Daca niciuna dintre solutii nu rezolva problema, escaladeaza catre echipa IT cu detalii despre simptomele intampinate, tipul clientului VPN folosit si mesajele de eroare afisate.

[mai mult...]

Raspberry Pi Music jukebox

Recommended boards:

  • Raspberry Pi 4 Model B

  • Raspberry Pi 3 Model B+

You will need:

Component Purpose
Raspberry Pi Main computer
MicroSD card (32GB+) Operating system
Power supply 5V 3A
Speakers Audio output
USB DAC or amplifier Better sound quality

Optional Upgrades

These make the jukebox much cooler:

  • Touchscreen display

  • Arcade buttons for song selection

  • Rotary knob for volume

  • LED lighting

  • Wooden jukebox-style case

  • Large USB drive for music storage

 Install the Jukebox Software

The easiest software for this project is Volumio.

It is designed specifically for DIY music streamers and jukeboxes.

Step 1 – Download Volumio

Download the image from:

https://volumio.com
Step 2:

Install Raspberry Pi Imager or balenaEtcher.

Flash the Volumio image to the SD card.

Steps:

  1. Insert SD card

  2. Open flashing software

  3. Select Volumio image

  4. Select SD card

  5. Flash

Insert the card into the Raspberry Pi.

4. First Boot

Power on the Raspberry Pi.

Wait about:

2–3 minutes

Volumio will automatically create a network interface.

5. Access the Jukebox Interface

From any device connected to the same network:

Open a browser and go to:

http://volumio.local

or

http://<raspberry-pi-ip>

You will see the Volumio music interface.

6. Add your Music Library

You can add music several ways.

Method 1 – USB drive

  1. Insert USB drive

  2. Volumio automatically scans it

  3. Music appears in library

Supported formats include:

  • MP3

  • FLAC

  • WAV

  • AAC

  • OGG

Method 2 – Network storage

You can mount:

  • NAS drives

  • Shared folders

  • External servers

Go to:

Settings → Sources

Add a network share.

Method 3 – Upload music

Some plugins allow direct uploads from the web interface.

7. Connect Speakers

Option 1 – HDMI audio

Connect the Pi to a TV or receiver.

Option 2 – 3.5mm headphone jack

Simple but average quality.

Option 3 – USB DAC (Best audio quality)

Use a USB audio adapter or DAC.

Common examples include:

  • AudioQuest DragonFly Black

  • HiFiBerry DAC+

These significantly improve sound quality.

8. Enable Internet Radio

Volumio includes thousands of stations.

Go to:

Browse → Web Radio

You can also manually add stream URLs.

9. Enable Spotify

Install the plugin:

Settings → Plugins → Spotify

This adds Spotify Connect.

Your jukebox will appear as a device in Spotify.

10. Make It a Real Jukebox

You can connect physical buttons to GPIO pins.

Example controls:

  • Next song

  • Previous song

  • Play / Pause

  • Volume

Python script example:

import RPi.GPIO as GPIO
import osGPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)

while True:
if GPIO.input(17) == False:
os.system(“mpc next”)

This lets you build arcade-style controls.

11. Add a Touchscreen

Add a display such as:

  • Raspberry Pi 7-inch Touchscreen Display

Mount it in a case and run the Volumio interface full screen.

This creates a self-contained jukebox interface.

12. Auto Start Music

You can configure playlists to start automatically.

In settings:

Playback → Startup Options

Example:

Play random music at startup

Perfect for parties or background music.

[mai mult...]

Wireless USB flash drive using Raspberry Pi

1. What this Project does

You will create a portable Wi-Fi storage device that:

  • Acts like a USB flash drive over Wi-Fi

  • Lets phones, laptops, or tablets connect wirelessly

  • Allows file upload/download

  • Can create its own Wi-Fi network

  • Runs from a power bank

Final result:

Phone / Laptop
│
Wi-Fi
│
Raspberry Pi
│
USB Flash Drive / SD Storage

2. Hardware Requirements

You need:

Core components

  • Raspberry Pi Zero W (best for portable)

  • MicroSD card (16–32GB recommended)

  • USB flash drive (optional for extra storage)

  • Micro USB OTG adapter

  • Power bank or USB power supply

Optional but useful

  • Case

  • Heat sinks

  • Small OLED screen for status

3. Install Raspberry Pi OS

Download Raspberry Pi OS and flash it.

Step 1 – Install Raspberry Pi Imager

Download:

Install Raspberry Pi Imager

Step 2 – Flash the SD card

Choose:

Raspberry Pi OS Lite

(Lite version is best for this project)

Configure before writing:

Enable:

  • SSH

  • Wi-Fi

  • Username/password

Insert the card into the Pi and boot.

4. Update the System

Connect via SSH:

ssh pi@raspberrypi.local

Update everything:

sudo apt update
sudo apt upgrade -y

5. Attach the USB Flash Drive

Insert your USB drive and check:

lsblk

Example output:

sda1 64G

Create mount point:

sudo mkdir /mnt/usb

Mount it:

sudo mount /dev/sda1 /mnt/usb

Make it permanent:

sudo nano /etc/fstab

Add:

/dev/sda1 /mnt/usb vfat defaults,nofail 0 0

Install Samba:

sudo apt install samba -y

Edit config:

sudo nano /etc/samba/smb.conf

Add at bottom:

[USB]
path = /mnt/usb
browseable = yes
writeable = yes
create mask = 0777
directory mask = 0777
public = yes
guest ok = yes

Restart Samba:

sudo systemctl restart smbd

7. Create a Wi-Fi Access Point

Install required tools:

sudo apt install hostapd dnsmasq -y

Stop services temporarily:

sudo systemctl stop hostapd
sudo systemctl stop dnsmasq

Edit:

sudo nano /etc/dhcpcd.conf

Add:

interface wlan0
static ip_address=192.168.4.1/24
nohook wpa_supplicant

Configure hostapd

Create config:

sudo nano /etc/hostapd/hostapd.conf

Add:

interface=wlan0
driver=nl80211
ssid=PiFlashDrive
hw_mode=g
channel=7
wmm_enabled=0
auth_algs=1
wpa=2
wpa_passphrase=raspberry123
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP

Tell hostapd to use the config:

sudo nano /etc/default/hostapd

Change:

DAEMON_CONF=”/etc/hostapd/hostapd.conf”

Configure DHCP

Backup original:

sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig

Create new config:

sudo nano /etc/dnsmasq.conf

Add:

interface=wlan0
dhcp-range=192.168.4.10,192.168.4.50,255.255.255.0,24h

8. Enable Services

Start services:

sudo systemctl start hostapd
sudo systemctl start dnsmasq

Enable on boot:

sudo systemctl enable hostapd
sudo systemctl enable dnsmasq

9. Test the Wireless Flash Drive

  1. Power the Raspberry Pi

  2. Look for Wi-Fi network:

PiFlashDrive

  1. Connect using password:

raspberry123

  1. Access storage from:

Windows:

\\192.168.4.1

Mac/Linux:

smb://192.168.4.1

You now have a wireless USB flash drive.

10. Optional Improvements

Web file manager

Install FileBrowser for browser uploads.

Add battery monitoring

Useful for portable setups.

Enable internet sharing

So the Pi acts as Wi-Fi storage + internet router.

Add SSD storage

For large capacity wireless storage.

11. Powering the Device

Use:

  • 10,000mAh power bank

  • 5V 2A output

Runtime:

6–12 hours

depending on model.

12. Final Result

You now have a DIY wireless USB drive that:

  • Works with phones

  • Works with Windows / macOS / Linux

  • Requires no cables

  • Can hold hundreds of GB.

[mai mult...]