Category Archives: Servers

When trying to open a page through HTTPS, you receive this error : SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long) This is probably due to a vhost IP mismatch/configuration error. The virtual host does not have the right IP address.

By default, the submission port is TCP-587. To change to another value, edit the following file : /var/qmail/supervise/submission/run And simply change the port number just before the last line : /usr/bin/tcpserver -v -R -H -l $HOSTNAME -x $TCP_CDB -c “$MAXSMTPD” \ -u “$QMAILDUID” -g “$NOFILESGID” 0 587 \ $SMTPD $VCHKPW /bin/true 2>&1 Of course, you… Read More »

Query refused shown on system log. unexpected RCODE (REFUSED) resolving ‘vhost.domain.tld/A/IN’: xxx.xxx.xxx.xxx#53 This indicate that one of your forwarders deny to resolve the query. You should remove/comment it.

Directory permission problem shown in system log when starting named. named[xxxx]: the working directory is not writable Owner as well as group should be “named” and both have “read-write-execute” (775) mode. sudo chmod g+w named

You may see the following notice in the system log. You need to raise the max open file in both system limit file and named configuration. Edit /etc/security/limits.conf and add : named soft nofile 4096 Inside the /var/named/chroot/etc/named.conf, add in the option section : files 4096;

On RHEL Linux v5, you may expect the following message in your system log : named[xxxxx]: network unreachable resolving ‘vhost.domain.tld/A/IN’: xxxx:xxx:xx::xxx#53 This is because by default, named try to listen IPv6 even if there is no IPv6 configured on the host. So you need to modify /etc/sysconfig/named and add the following parameter to tell bind… Read More »

By default, Exchange use the local name for the ReceiveConnecter, which could be problematic with anti-spam measures on most MTA on the Internet.  This is recommended to use your reverse dns name (FQDN), which in most case, should or must be the MX record. To do so, open the Exchange Management Shell and use the… Read More »

Using a restricted Webmin account for module “Users and Groups” to create new user, the following error occur : Failed to save user : User root is already using UID 0 This is because permission on User and Groups module for this user are incorrect.  The user has no right to increment the UID. To… Read More »