You can also receive an SSL error because the certificate is self-signed and not provided by a Certificate Authority. You will then get a warning that the SSL does not match the thing you are requesting and that the connection is not secure. Essentially, this error means that the domain or hostname listed in the SSL is not attached to that server or service. When connecting to any service that uses an SSL, you can sometimes run into a “Domain Mismatch” error. A “ 401 Unauthorized” message will appear if your credentials are not correct.Īn example of a failed FTP login: Login failed: 530 Login incorrectĪn example of a failed SSH login: Permission DeniedĪn example of a failed MySQL login: Access denied for userĪre You Receiving Some Other Security Message? In a browser, attempts to connect to a website give a “ 403 Forbidden” if permissions on the server are incorrect. These mean that your login failed, but you still connected to the server. If this is the case, you will get an “Unauthorized” or an “Authentication Failed” error. Are You Receiving an Authentication Error?ĭuring this time, ports remain closed until the firewall has become fully active. Give the server a few moments to bring all of its services online including the firewall and retry connecting. During this time, ports remain closed until the firewall has become fully active. If you are in the process of rebooting the server, this may also mean that the firewall has not started. Below is an example of an SSH connection attempt with a closed port. SSH: 22 (commonly moved to a different port)Ī closed port will result in a “Connection Refused” message, rather than a failure message.If you can’t access a single service like mail, FTP, SSH, etc., there may be an issue with a firewall, or perhaps something is listening on a port that is not the default. Can You Access Your Server Through Other Means? If you can access other sites and services, then continue to test a few more elements. Can You Connect to Other Sites on the Internet?Īccess to other sites on the Internet may indicate local workstation or local network issues. Here are some aspects to check before jumping to conclusions. When connecting to a server, many aspects can cause your connection to not complete correctly.

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