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just to be sure - have you also checked that it isnt blocked by the firewall?

Yes, you can delete old tmp files there. for details see: How to clean temporary Plesk files on a Linux server

A possible approach for you would be to migrate the vhosts directory of the domains, see the following knowledgebase entry How to change virtual hosts location in Plesk for Linux?

please take into consider to tell a bit more in detail,like which clients. There are several knowledgebase articles around about this issue with different solutions. and how looks like your /etc/dovecot/conf.d/11-plesk-security-ssl.conf

afaik Plesk Obsidian, webmail uses PHP 7.3 that comes with Plesk. How to change PHP version for webmail in Plesk for Linux

Maybe you hit this issue and have to use integer values in bytes for post_max_size and upload_max_filesize parameters: Cannot upload any file to Plesk after changing post_max_size and upload_max_filesize: The file "Test.jpg" is too big. Try to upload this file via FTP and just for the sake of...

Sorry, as I have not used nginx plus so far, I can't help you with this point. But you might take a look at this popular forum post, it's about how to use nginx with additional functions/modules as pagespeed, brotli... and might be able to help you. Input - Bash script to compile Nginx from...

you might use/install in Plesk Panel > Extension or via add components Webserver Configurations Troubleshooter see: Plesk Webserver Configuration Troubleshooter often it tells you more detailed about the issue of the config files..

maybe this knowledgebase entry might be helpfull: Roundcube/Horde webmail and websites on FastCGI are not accessible: Connection reset by peer: mod_fcgid: error reading data from FastCGI server

The corresponding UI options are available in the Customer Panel in Websites & Domains > <domain_name> > Apache & nginx Settings. see also: How to modify domain's configurations in Plesk permanently, How to get and set Additional Apache/Nginx directives via CLI? Apache and Nginx Settings & How...

you might open am report: Reports

well you allready used the 2 most common workarounds, so maybe there are more details in the logfiles like /var/log/plesk-roundcube

if you enable the firewall whats the output of # ip6tables -L

First, when the system requires more memory than is physically available it starts to swap, see and understand: All about Linux swap space - Linux.com So what u are trying to achieve is that your physically memory is used as best, therefor search for How to adjust and optimize server...

unfortunately this issue was reportet early 2018 and seems still to exist.Here is the workaround for it: IPv6 traffic doesn't work anymore after set System policy for outgoing traffic to Deny: No route to host. Would be nice if the workarround helps you to leave a comment on the knowledgebase...

perhaps you can review the assigned Service plan of the Websites and check the settings. Web user > Ressources > show more Password Protected Directories > Permissions > show more available permissions Website Copying > Permissions > show more available permissions ...

Yes I hoped that with Plesk Obsidian more and more support for TLS 1.3 will be added also under Ubuntu 16.x and not "only" for customers’ websites, as well as for mail services and packages like Dovecot & Postfix. But good to know that a switch to a more recent operating system the TLS 1.3...

Thanks for the answer, well I tried the usual settings in postfix for TLS 1.3 under my constellation, but obviously without success. TLS 1.3 is simply not used and my guess is that it's because of the Plesk postfix that doesn't seem to support TLS 1.3 under Ubuntu 16.x or isnt build against...

as a workaround you can try to add .ftpaccess file to your specific folder <Directory /var/www/vhosts/DOMAIN/httpdocs/SOME_DIR> <Limit CWD PWD DIRS READ> AllowUser YOUR_FTP_USER </Limit> <Limit ALL> DenyUser YOUR_FTP_USER </Limit> </Directory>

just to narrow down the issue, please try to add the directive manually and check again