iOS 13 Probleme Mail

in case your iPhone with iOS 13 does not receive mails:

openssl s_client -showcerts -connect mail.123.net:993 </dev/null 2>/dev/null | openssl x509 -outform PEM > ~/Desktop/123.net.pem

NTP at Windows Server 2012R2

In case you have problems getting the right time:

w32tm /config /syncfromflags:manual /update /reliable:yes /manualpeerlist:"0.de.pool.ntp.org 1.de.pool.ntp.org 2.de.pool.ntp.org 3.de.pool.ntp.org"

ESXi 6.7 Transfer Machines

In case you can not transfer via scp:

esxcli network firewall set -e false

esxcli network firewall set -e true

SNOM VoIP Telefon hat Probleme mit FritzBox AVM

In case your SNOM will not register at your FritzBox

just try this:
Open your Identity Setting Page
Go to "Outbound Proxy" and enter FQDN_or_IP_of_server;transport=tcp

i.e. fritz.box;transport=tcp

ESXi Network Card

esxcli network nic list

vmkchdev -l |grep vmnic{ID OF NETWORK CARD}

ssh Processes filter by process id

netstat -tlnp | awk '/:80 */ {split($NF,a,"/"); print a[2],a[1]}'

lsof -i tcp:80

lsof | tail -n +2 | awk '{print $1 " " $2}'

Confluence 6.15.1 Null Pointer Exception-> FontConfiguration error ...

after an update to ubuntu 18 LTS
the java font configuration is missing,
so:

sudo apt install -y fontconfig