Solution “Client did not reuse SSL session from control channel, rejecting data connection”

I once ran ProFTPd with TLS and users connected successfully, but one client was trying to transfer files via cURL and got the error:

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Solution Invalid command ‘Header’, perhaps misspelled or defined by a module not included in the server configuration

Once I transferred one site from one server to another Ubuntu server and after installing Apache2 I noticed the following error in the logs:

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Solution AH00558: apache2: Could not reliably determine the server’s fully qualified domain name

Once after installing and configuring Apache2 on Ubuntu Server 20.04, I noticed the following error in the /var/log/apache2/error.log logs:

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Zabbix. Dynamic Indexes

I have come across quite a few switches in which SNMP indices can shift, for example, depending on the number of added VLANs, that is, the first port will no longer be ifIndex.1, but for example ifIndex.5. On Mikrotik RB2011UiAS-RM, the sfp1 port is ifIndex.1, and ether1 is already ifIndex.2. In Huawei switches and OLT, I saw sky-high figures and, in addition, they also shifted. Therefore, in order not to create separate templates for the same device model, Zabbix has a solution for this.

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