Outlook Error 421 Too Many Connections
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Too Many Concurrent Smtp Connections Outlook
Display results as threads More... Useful Searches Recent Posts Resources Resources Quick Links Search Resources Most Active Authors 421 too many concurrent smtp connections outlook Latest Reviews Feature Requests Defects Menu Log in Sign up The Community Forums Interact with an entire community of cPanel & WHM users! cPanel Forums > cPanel & WHM® (for too many concurrent smtp connections thunderbird Linux® Servers) > E-mail Discussions > This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More. 421 Too many concurrent SMTP connections; please try again later Discussion in 'E-mail Discussions' started by DWHS.net, Mar 1, 2009. DWHS.net Well-Known Member PartnerNOC Joined: Jul 28, 2002 Messages: 1,551 Likes Received: 4 Trophy
421 Too Many Concurrent Smtp Connections Cpanel
Points: 38 Location: LA, Costa RIca cPanel Access Level: Root Administrator Anyone know what causes the server to have too many concurrent SMTP connections? Is it the firewall or just exim preset limit. Some sending emails are failing from this. Live in the moment - WebHost.pro Fast Web Hosting | Affiliate Program | Host Speed Test #1 DWHS.net, Mar 1, 2009 JPC-Martin Active Member PartnerNOC Joined: May 31, 2008 Messages: 37 Likes Received: 1 Trophy Points: 8 It means that there are to many open SMTP connections either incoming or outgoing.The default is 20, you can raise that with the smtp_accept_max command in your configuration file. you can check connections through command: cat /etc/exim.conf |grep smtp_accept_max Martin.K | JaguarPC.com JaguarPC High Class Hosting since 1998* Unmanaged VPS Hosting | Managed VPS Hosting | Fail Over Hosting #2 JPC-Martin, Mar 1, 2009 DWHS.net Well-Known Member PartnerNOC Joined: Jul 28, 2002 Messages: 1,551 Likes Received: 4 Trophy Points: 38 Location: LA, Costa RIca cPanel Access Level: Root Administrator JPC-Martin said: ↑ It means that there are to many
Guy, we highly recommend that you visit our Guide for New Members. Solved: Too many concurrent SMTP connections Discussion in 'Web & Email' started by westone, Apr too many concurrent smtp connections outlook for mac 20, 2012. Thread Status: Not open for further replies. Advertisement westone Thread Starter Joined: smtp04.mailcore.me: too many concurrent smtp connections; please try again later. Jul 6, 2002 Messages: 211 Could anyone help me with this regular email error. It happens when I try to send an
The Server Responded 421 Too Many Concurrent S
email. Usually it will clear itself eventually. The error message is: An unknown error has occurred. Account: 'pop3.blueyonder.co.uk (1)', Server: 'smtp.blueyonder.co.uk', Protocol: SMTP, Server Response: '421 know-smtpout-4.server.virginmedia.net: Too many concurrent SMTP connections; please try again https://forums.cpanel.net/threads/421-too-many-concurrent-smtp-connections-please-try-again-later.109433/ later', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67 I don't understand what "Too many concurrent SMTP connections" means, or what I can do about it. Thanks for your help. Tech Support Guy System Info Utility version 1.0.0.2 OS Version: Microsoft Windows XP Professional, Service Pack 3, 32 bit Processor: Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz, x86 Family 6 Model 15 Stepping 6 Processor Count: 2 RAM: 3070 Mb https://forums.techguy.org/threads/solved-too-many-concurrent-smtp-connections.1050076/ Graphics Card: NVIDIA GeForce 6200 LE, 512 Mb Hard Drives: C: Total - 232048 MB, Free - 166478 MB; D: Total - 6404 MB, Free - 1507 MB; Motherboard: ASUSTek Computer INC., Basswood Antivirus: BullGuard Antivirus, Updated: Yes, On-Demand Scanner: Enabled westone, Apr 20, 2012 #1 awamutu Joined: Apr 20, 2012 Messages: 4 i just called them earlier for help and got a solution!!! "An unknown error has occurred. Account: 'pop3.blueyonder.co.uk', Server: 'smtp.blueyonder.co.uk', Protocol: SMTP, Server Response: '421 know-smtpout-4.server.virginmedia.net: Too many concurrent SMTP connections; please try again later', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67" what it was is that the mail was going out on an old server so the man walked me through switching to the new server, for both sending and receiving and now, no problems! go to tools/ accounts/ mail tab/ click on your account and then properties/ servers/ make sure the incoming says pop3.virginmedia.com and the outgoing says smtp.virginmedia.com then change your account name to your email address and enter your password and then tick my server requires authentication/ apply/ settings/ tick log on using email and password (enter these)/ ok/ advanced tab/ tick both server requires authentication boxes and make sure the numbers are 465 for outgoing and 995 for incoming/ a
2015 No Comments on Error 421: too many concurrent smtp connections Error 421: too many concurrent smtp connections4.71 (94.29%) 7 votesOn high traffic email servers you may see this kind of errors, it's https://cpaneltips.com/error-421-too-many-concurrent-smtp-connections/ very normal in some situations when your users use lot of email. It basically means that there are a lot of open SMTP connections (incoming and/or outgoing). The exact error message may be something like:421 Too many concurrent SMTP connections from this IP address; please try again later.How to fix Error 421 too many concurrent smtp connections?First we have to check out what's the smtp_accept_max value too many for our email server. In the case of cPanel servers, you just have to run a grep command against Exim configuration file, example:grep smtp_accept_max /etc/exim.confThen edit the variable and assign more simultaneous connections. Restart Exim to apply changes:service exim restartWhy does the Error 421 too many concurrent smtp connections happen? As we said, there are a number of valid reasons, but also it may too many concurrent indicate some kind of serious problem with your server.Valid reasons:Normal high traffic: in some times of the year like holidays, special dates like july 4th, christmas or new year.Newsletters: some of your users may be using massive newsletter and this can cause Exim to serve more connections than usual.Ilegitimate reasons:Coding errors: we've seen email loops in the code of webpages more than once, also con email client such as Outlook. This kind of behaviour can cause emails to be sent again and again, opening too many connections.Virus/Malware: malware and virus are uploaded to thousand of websites each day, causing damage in networks, companies and more. And one of the most common activities that crackers love is to use your email server as mail bomb server, to send tons of emails each day.Email hacking: if you are using weak passwords (like john123) on your email accounts they can be hacked easily using brute force attacks, and then used to send outgoing spam. Share on Twitter LinkedIn Google+ Email Facebook Exim Post navigation ← How to increase /tmp partition size on cPanel How to fix disk quotas on a cPanel server → cPanel T