Tuesday, April 24, 2018

Error 53, or not available error on Windows 10

Microsoft in their infinite wisdom have horribly broken SMB1 functionality on Windows 10.  No simple way to turn it back on, nor any explanation of why it is broken.

When you try to connect to a share via the protocol \\\share you get an error not available, or an error 53.

The page below is an extended explanation of the justification, FWIW.  If there was a comprehensible error or change there would be less sarcasm and criticism here,  but just removing an insecure and broken protocol that they invented which was wrong and not putting in a way to recover when a release upgrade is made is just nuts.

When you upgrade to the 1709 creator release, or so, you will see this happen with your shares that have SMB1 and no SMB2 version support.  FWIW, I believe the latest and approved SMB is 4. 


Knowledge base workaround to re-enable it or get it back


seems to be in the same spot you enable and install the Ubuntu shell support

Windows server

Server Manager - Dashboard method

Windows 8 and 10

Add-Remove Programs client method


Saturday, April 21, 2018

Bluetooth serial Raspberry Pi 3

set up raspberry pi 3 bluetooth to allow serial connection once paired.


Basic part of above which covers setting up bluetooth connection.  No pass code, all parings accepted.

rfcomm connects and presents a shell session on connection w/o password, so more can be done to secure this.

You’ll create this file in the /home/pi directory, like so:

$ sudo nano /home/pi/btserial.sh
Add the following lines to the script:

#!/bin/bash -e

#Edit the display name of the RaspberryPi so you can distinguish
#your unit from others in the Bluetooth console
#(very useful in a class setting)

echo PRETTY_HOSTNAME=raspberrypi > /etc/machine-info

# Edit /lib/systemd/system/bluetooth.service to enable BT services
sudo sed -i: 's|^Exec.*toothd$| \
ExecStart=/usr/lib/bluetooth/bluetoothd -C \
ExecStartPost=/usr/bin/sdptool add SP \
ExecStartPost=/bin/hciconfig hci0 piscan \
|g' /lib/systemd/system/bluetooth.service

# create /etc/systemd/system/rfcomm.service to enable 
# the Bluetooth serial port from systemctl
sudo cat <<EOF | sudo tee /etc/systemd/system/rfcomm.service > /dev/null
Description=RFCOMM service

ExecStart=/usr/bin/rfcomm watch hci0 1 getty rfcomm0 115200 vt100 -a pi


# enable the new rfcomm service
sudo systemctl enable rfcomm

# start the rfcomm service
sudo systemctl restart rfcomm
Save the file, and then make it executable by updating its permissions like so:

$ chmod 755 /home/pi/btserial.sh
Now you have the basics of the script required to turn on the Bluetooth service and configure it.  But to do this 100% headless, you’ll need to run this new script on startup. Let’s edit /etc/rc.local to launch this script automatically.

$ sudo nano /etc/rc.local
Add the following lines after the initial comments:

#Launch bluetooth service startup script /home/pi/btserial.sh
sudo /home/pi/btserial.sh &
Save the rc.local script, unmount the image, and write it to an SD Card using your favorite tool (mine is ApplePiBaker).
Now you are ready to go.  Plug in power to the Rpi and give it 30 seconds or so to startup. Then unplug it, and plug it in again and let it boot up a second time.  Restarting the Bluetooth service doesn’t work correctly, so we need to reboot.

Wednesday, April 18, 2018

Centos and Redhat EL firewall port opening


Centos 7
To open up a new port (e.g., TCP/80) permanently, use these commands.
$ sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
$ sudo firewall-cmd --reload 
Check the updated rules with:
$ firewall-cmd --list-all
Centos 6, iptables
Use iptables command to open up a new TCP/UDP port in the firewall. To save the updated rule permanently, you need the second command.
$ sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT
$ sudo service iptables save 
Start / Stop / disable firewall completely


Sunday, April 15, 2018

Installing lamp and webmin on raspbian

Another writeup on installing a lamp server setup on a Raspberry Pi.  Probably need a 3 or 3+ to have any real justification, YMMV

sudo groupadd -f -g33 www-data
sudo apt-get update
sudo apt-get install apache2 php5 libapache2-mod-php5
sudo apt-get install mysql-server mysql-client php5-mysql
sudo apt-get  install  phpmyadmin
sudo apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl \
libpam-runtime libio-pty-perl apt-show-versions python 


mkdir webmin
cd webmin
wget http://prdownloads.sourceforge.net/webadmin/webmin-1.580.tar.gz
gunzip webmin-1.580.tar.gz
tar xf webmin-1.580.tar
cd webmin-1.580
sudo ./setup.sh /usr/local/webmin

another install page for raspbian