demian_ku Posted January 11, 2007 Share Posted January 11, 2007 Hi, I´m writing to you because between 7th and 8th January I had the following problem with the SMTP server: The mail server is running Qmail with tcpserver and daemontools, and during the days I have just mentioned it generated an excess of connections of the program rblsmtpd. This happened because whenever the program made a query to bl.spamcop.net the connection stayed in "close_wait" state, and the consequence was about 92 or 115 connections in "close_wait" state. This caused the server to stop accepting more SMTP connections and it didn´t allow the clients to connect to the server and send mail. As the primary mail server didn´t accept more connections, these connections were sent to the secondary mail server, which finally was saturated -since we have near 1300 clients-. I restarted the server, but the connections rblsmtpd in "close_wait" state increased immediately, and the server returned to the previous behavior -not accepting more SMTP connections-. Finally I realized that the solution to the problem was "killing" the rblsmtpd connections that were in "close_wait" state and then the clients were able to connect again to the server without having any problem. Therefore, the only idea I could think of was creating a scri_pt that verified the rblsmtpd connections in "close_wait" state every 5 minutes and "killed" them. I had been working with spamcop for blocking the spam on the server since long time ago, and nothing like this had ever happened to me. That´s why I would like to know if the last days you had had any kind of problem and, if not, I would be grateful if you could please suggest me a better solution to this problem than what I thought of. I also need to know how much time the rblsmtpd takes for making a query and if every time it makes a query the connection is closed immediately (this is the way it works?) I really thank you for your help, since it´s fairly important for me to solve this problem. P.D.: my concurrency incoming of SMTP connections is set to 70 at the moment. Link to comment Share on other sites More sharing options...
turetzsr Posted January 11, 2007 Share Posted January 11, 2007 Hi! ...Sorry I can not answer your question (I am not an e-mail server admin but some other members are, so you may get an answer from one of them) but I just wanted to acknowledge your inquiry. ...Good luck! Link to comment Share on other sites More sharing options...
demian_ku Posted January 11, 2007 Author Share Posted January 11, 2007 Hi! ...Sorry I can not answer your question (I am not an e-mail server admin but some other members are, so you may get an answer from one of them) but I just wanted to acknowledge your inquiry. ...Good luck! turetzsr, thank you for your feedback. It's good to know that some members will be able to answer my questions. Link to comment Share on other sites More sharing options...
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