We help IT Professionals succeed at work.

multi-threaded socket communication problem

lll888
lll888 asked
on
Hi there,

In my app, I need to open many threads which all connect to a same server and same port, reading and writing data at the same time. But the problem is that after some time of execution, I got error something like "ESocketError: maximum number of sockets allowed....", it seems that if there's too many threads(actually over 10 or so), then it won't let me connect.

I use TClientSocket to do the socket communication. So i'd like to ask why I am getting this error? Is there any limit on number of threads connecting to a same server and port number?

Thanks for any input.
Comment
Watch Question

Commented:
What OS are you running on? Is the server on the same machine as the client?

Author

Commented:
i am running on Win2k, no, the server is a remote one, actually it's a mail server. I used tcp/ip to make a direct connection to it. If i use only 1 thread, it works alright, but if I use many threads, i always got that error.
Commented:
Ok, this takes away several possibilities for the cause and practically eliminates your machine or application as problem source.

Note that most mail servers are configured in such a way that they only accept a certain number of simultaneous connections from one specific host. That's because like this the possibilities for spamming or DOS attacks are limited. So your next step would probably be to ask the postmaster of this mail server for limitations of their service.

Commented:
are you creating thos sockets connection dynamicly? if the answer is yes... then... did you realease each one of them?

"ESocketError: maximum number of sockets allowed" sounds more a local problem than a server problem, however what kind of server are you connecting to (email, web, or custom)
ADMINISTRATION WILL BE CONTACTING YOU SHORTLY.  Moderators Computer101 or Netminder will return to finalize these if still open in seven days.  Please post closing recommendations before that time.

Question(s) below appears to have been abandoned. Your options are:
 
1. Accept a Comment As Answer (use the button next to the Expert's name).
2. Close the question if the information was not useful to you, but may help others. You must tell the participants why you wish to do this, and allow for Expert response.  This choice will include a refund to you, and will move this question to our PAQ (Previously Asked Question) database.  If you found information outside this question thread, please add it.
3. Ask Community Support to help split points between participating experts, or just comment here with details and we'll respond with the process.
4. Delete the question (if it has no potential value for others).
   --> Post comments for expert of your intention to delete and why
   --> You cannot delete a question with comments, special handling by a Moderator is required.

For special handling needs, please post a zero point question in the link below and include the URL (question QID/link) that it regards with details.
http://www.experts-exchange.com/jsp/qList.jsp?ta=commspt
 
Please click the Help Desk link on the left for Member Guidelines, Member Agreement and the Question/Answer process for further information, if needed.  http://www.experts-exchange.com/jsp/cmtyHelpDesk.jsp

Click you Member Profile to view your question history and keep them all current with updates as the collaboration effort continues, to track all your open and locked questions at this site.  If you are an EE Pro user, use the Power Search option to find them.  Anytime you have questions which are LOCKED with a Proposed Answer but does not serve your needs, please reject it and add comments as to why.  In addition, when you do grade the question, if the grade is less than an A, please add a comment as to why.  This helps all involved, as well as future persons who may access this item in the future to seek help.

To view your open questions, please click the following link(s) and keep them all current with updates.
http://www.experts-exchange.com/questions/Q.20095016.html
http://www.experts-exchange.com/questions/Q.20189701.html


To view your locked questions, please click the following link(s) and evaluate the proposed answer.
http://www.experts-exchange.com/questions/Q.20014065.html
http://www.experts-exchange.com/questions/Q.20118812.html

PLEASE DO NOT AWARD THE POINTS TO ME.  
 
------------>  EXPERTS:  Please leave any comments regarding your closing recommendations if this item remains inactive another seven (7) days.  Also, if you are interested in the cleanup effort, please click this link http://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=commspt&qid=20274643

Moderators will finalize this question if still open in 7 days, by either moving this to the PAQ (Previously Asked Questions) at zero points, deleting it or awarding expert(s) when recommendations are made, or an independent determination can be made.  Expert input is always appreciated to determine the fair outcome.
 
Thank you everyone.
 
Moondancer
Moderator @ Experts Exchange
lll888:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
EXPERTS:
Post your closing recommendations!  No comment means you don't care.
CERTIFIED EXPERT

Commented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

accept AvonWyss's comment as answer

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Thanks,

geobul
EE Cleanup Volunteer

Explore More ContentExplore courses, solutions, and other research materials related to this topic.