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How to fix error ‘421 Too many concurrent SMTP connections’ in cPanel and DirectAdmin servers
Managing and troubleshooting mail servers forms a vital part of the Outsourced Website Support services we provide to shared server owners. Among the common mail server errors, 421 is a common one that happens due to 'too many concurrent SMTP connections'. This error...
How to change Docker directory
Maintaining adequate disk space is a crucial task we perform in our outsourced server management services. Lack of free space can often lead to server crashes. In Docker machines, '/var/lib/docker' is the directory where the Docker images and the container data are...
How to fix “550 Requested action not taken: mailbox unavailable or not local” in Plesk servers
Mail errors are commonly encountered issues in our role as Website support specialists. In Plesk Windows servers, the default mail server is MailEnable. Plesk account owners sometimes report the MailEnable error 'SMTP server response: 550 Requested action not taken:...
How to prevent SWEET32 Birthday Attacks on OpenVPN via Blowfish cipher vulnerability (CVE-2016-6329)
In our previous post, we saw how to secure your OpenSSL servers from SWEET32 Birthday Attack. But OpenSSL isn't the only server that's affected by this bug. Use of block cipher encryption algorithm makes OpenVPN servers also vulnerable to this attack. The OpenVPN...
SWEET32 Birthday Attack (CVE-2016-2183): Fix TLS vulnerability
Over 80% of websites on the internet are vulnerable to hacks and attacks. In our role as hosting support engineers for web hosts, we perform periodic security scans and updates in servers to protect them from hacks. A recent bug that affects the servers is...
Disable RC4 ciphers in cPanel/WHM servers – Why and How to do it?
Secure transmission of data requires encrypting the data in many ways. Ciphers are the tools used for data encryption. RC4 is one such cipher. RC4 generates a stream of pseudo-random bits. These bits are combined with plain text using 'bit-wise exclusive-or' pattern...
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