If you find in your apache error logs some lines with:

No space left on device. Couldn't create accept lock

and a normal service restart does not help it has likely something to do with Semaphores running out.

Try a service shutdown and check your apache semaphores afterwards with:
# ipcs | grep apache

Should there still be a lot of them you can delete them with following command:
# ipcs -s | grep apache | perl -e 'while (<STDIN>) { @a=split(/\s+/); print `ipcrm sem $a[1]`}'

Now start your apache normally and verify the logs if the problem has gone.

Hi, enabling TLS on your postfix server is quite simple. Only enable it using following lines in your main.cf config file (usually /etc/postfix/main.cf):

• smtpd_use_tls = yes (enable the TLS usage)
• smtpd_tls_cert_file = /etc/pki/tls/certs/yourcertificate.crt (set your server certificate file)
• smtpd_tls_key_file = /etc/pki/tls/private/yourkey.key (set your server key file)
• smtpd_tls_loglevel = 1 (enable TLS logging*)
• smtpd_tls_security = may (set TLS security level*)
• smtpd_tls_received_header = yes (write TLS status to email header)

​*) TLS logging:
this setting's values are different in postfix v2.9 and later. for example in postfix 2.9+ the TLS handshake is logged even if the value is 0. On the other hand you need to set the value to 1 in postfix earlier to 2.9.

*) TLS security level:
may – if there is an encryption available it will be used
encrypt – means enforce the encryption. Any connection without TLS is refused

you can find more infos on the postfix website.

You can find all VMware Tools packages on

https://packages.vmware.com/tools/esx/index.html

They provide an .exe and .iso file for windows and package repositories for different linux distributions like RHEL, CentOS, SuSE or Ubuntu.

Here an example how to setup a package repository for ESXi 4.1 and CentOS5:

• create a repo file
  # touch /etc/yum.repos.d/vmware-tools.repo
• then open it
  # vim /etc/yum.repos.d/vmware-tools.repo
• and paste following text inside:
  [VMWare-tools]
  name=VMWare Tools Packages for Enterprise Linux 5 – $basearch
  baseurl=https://packages.vmware.com/tools/esx/4.1latest/rhel5/$basearch
  enabled=1
  gpgcheck=0
• save it and close the file.
• now you can install the vmware-tools (desktop) or vmware-tools-nox (server) package.
• after install reboot the computer

​replace inside the baseurl "4.1latest" with your esxi version and "rhel5" with your os version.