CentOS 8.x openvpn client troubleshooting

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Bad compression stub decompression header byte: 102 error

It is possible that while connecting to a VPN server (Could be firewall eg sophos or a openvpn server), that client receives error such as:

Bad compression stub decompression header byte: 102

These are often seen only while initiating a new connection to particular machines. This can be due to disabling of lzo-compression in configuration. To fix this edit the openvpn configuration file and update 'comp-lzo' from no to adaptive as:

comp-lzo adaptive

After this during connection you should not see the same error.

This is valid from openvpn 2.4 onwards. So you can also validate openvpn version using 'rpm -qa openvpn' before making above change.

Refer:

• https://www.cipheronic.com/bad-compression-stub-decompression-header-byte-102-solved/

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