Hosting Question? Find the Solution -

KNOWNHOST KNOWLEDGE BASE

Browse our Guides, Articles, and How-To's

How to debug and fix 500 internal server error?

Are you hosting a website somewhere around the globe? Then most likely, you faced an INTERNAL SERVER ERROR. The error itself states the error is internal, which means it has something to do with the server. How to debug 500 internal server error? Mostly there are three reasons which cause Internal Server Error, Corrupt/Misconfigured .htaccess file. […]

DirectAdmin License has Expired

Invalid license errors are either due to wrong uid/lid, IP, or date, or the DA cron isn’t running. You should first see if the cron is running by searching the cron log for license update crons, If not, try to run the cron manually, If you see errors like the following, you may need to […]

SMTP Response 220

Category: Other
Tags: # # #

Description: <SERVER> Service ready. What does this mean? This is a general reply advising that the SMTP server is ready to proceed with the next command. There is not a “fix” for this SMTP Response code, at this point the SMTP server is ready to continue successfully. Related Articles: SMTP Response 252 SMTP Error 446 […]

SMTP Response 221

Category: Other
Tags: # # #

Description: <SERVER> Service closing transmission channel What does this mean? This response is stating the the session or connection to the mail server is now ending. Suggesting that all processes have completed, this could be successful or due to failures. SMTP Error 221 Examples There is not a “fix” for this SMTP Response code, as […]

SMTP Response 250

Category: Other
Tags: # # #

Description: Requested mail action okay, completed. What does this mean? Fantastic! Your email message was delivered, as expected. This is the polar opposite of an error. There is not a “fix” for this SMTP Response code, as it’s not specifically an error. Related Articles: SMTP Response 220 SMTP Error 432 SMTP Error 452 SMTP Error […]

SMTP Error 111

Category: Other
Tags: # # #

Description: Connection refused or inability to open an SMTP stream. What does this mean? This error is typically referencing a connection issue to the remove SMTP/Mail server. Often in relation to firewalls or misspelled domains. How to fix SMTP Error 111? As in most cases, you’ll want to ensure that the email address being sent […]

SMTP Error 211

Category: Other
Tags: # # #

Description: System status message or system help reply. What does this mean? This is a response from the server replying with system help information regarding to your query. There is not a “fix” for this SMTP Response code, as it’s not specifically an error. Related Articles: SMTP Error 101 SMTP Error 447 SMTP Error 501 […]

SMTP Error 214

Category: Other
Tags: # # #

Description: Help message (Information on non-standard command). What does this mean? This response should also contain information specific to your server. Most commonly also include a link/URL for a FAQ page. There is not a “fix” for this SMTP Response code, however the error may provide a link for more details. Related Articles: SMTP Response […]

SMTP Error 553

Category: Other
Tags: # # #

Description: Requested action not taken: mailbox name not allowed (e.g., mailbox syntax incorrect). What does this mean? The receiving mail server was not able to verify the email address. How to fix SMTP Error 553? Check to make sure all email addresses you are sending to (‘TO:’, ‘CC:’, ‘BCC:’) are correct. Related Articles: SMTP Error […]

SMTP Error 554

Category: Other
Tags: # # #

Description: Transaction failed (Or, in the case of a connection-opening response, “No SMTP service here”). What does this mean? The receiving mail server will not accept your message. Typically in relation to your sending mail server being blacklisted. How to fix SMTP Error 554? Check your server’s IP for any possible blacklisting. If not blacklisted, […]