HTTP2 TransportException error "Could not reach the remote Mailgun server" after updating to laravel 9

[groenewege]

Hi I'm Gunther,

If someone else has updated a website to laravel 9 that sends email from a queue on ubuntu 18.04 and is sometimes seeing the HTTP2 TransportException error "Could not reach the remote Mailgun server", your cron version is the culprit.

I am using an ubuntu 18.04 server on Digital Ocean through Laravel Forge and the included version of cron (7.58.0) sometimes throws errors when using the HTTP2 protocol to communicate with Mailgun.

You can update your cron version using the following commands :

cd /usr/local/src

sudo apt-get update
sudo apt-get install -y libssl-dev autoconf libtool make

sudo apt install zlib1g

sudo wget https://curl.haxx.se/download/curl-7.86.0.zip
sudo unzip curl-7.86.0.zip

cd curl-7.86.0     
sudo ./buildconf
sudo ./configure --with-ssl --with-zlib
sudo make
sudo make install

sudo mv /usr/bin/curl /usr/bin/curl.bak
sudo cp /usr/local/bin/curl /usr/bin/curl

Then you can check the new version of curl with the command : curl -Vv

If you get a curl symbol lookup error (undefined symbol), run : sudo ldconfig

Finally restart your server. (ngninx, php, queue)

I hope this will save someone some time.