This has been discussed many times. It's entirely up to the admins.

You will need to specify which server and the exact error message.

New servers are announced when and only if they are approved.

Try a different server. There are many.

In order to help you, need to know which server you are having trouble with and the exact message you receive. Also, what happens when you try a different server?

---mIRC 7.57 released [by Khaled]--- Dear mIRC User, mIRC v7.57 has been released today. This is a small update that addresses a number of issues reported by users since the last release. It includes improvements, changes and fixes to a number of features, including: Fixed OpenSSL issue that was cau...

From Khaled: Dear mIRC User, mIRC v7.56 has been released today. This is a small update that addresses a number of issues reported by users since the last release. It includes improvements, changes and fixes to a number of features, including: Added $urlget() identifier that downloads content from h...

This version of mIRC is primarily a security release. mIRC users are advised to upgrade due to a security issue that may allow someone to trigger a remote code execution vulnerability in some situations. This issue affects all versions of mIRC. This update also includes changes and fixes to a number...

From Khaled: Dear mIRC User, mIRC v7.54 has been released today. This is a small update that addresses a number of issues reported by users since the last release. It includes improvements, changes and fixes to a number of features, including: Fixed API call that prevented mIRC from running on Windo...

From Khaled: Khaled: mIRC 7.53 released Dear mIRC User, mIRC v7.53 has been released today. This release includes improvements, changes and fixes to a number of features, including: Added support for voice selection to speech options dialog. Added support for CPRIVMSG and CNOTICE if listed in numeri...

Addendum: ssl.efnet.org

You will have to contact BitchX direct for instructons on how to use their product and other support. I am unable to locate a current list of SSL servers. You will have to check the MOTDs.

If your failed joining attempt was accidental, I don't see the problem.

As you can see from the error message, it tells you exactly what to do.

It works without the port designation. Try that.