BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  About TCP port with Indy          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message David Guest Posted: Thu Apr 29, 2004 7:28 am    Post subject: About TCP port with Indy Hi Indy team, I have a question, I build a TCP server, for example, a SMTP server with TIdSMTPServer and run it, and in another computer I connect to this SMTP server with telnet command as: telnet *.*.*.* 25 Yes, I can connect to it. But if I change the SMTP server port from 25 to another value, such as 26, and the other computer is in the different IP section(other ISP), I can not connect to the SMTP server with the command: telnet *.*.*.* 26 but if change the bind port to 25, works well. Why? Thanks David Back to top Charles Stack Guest Posted: Thu Apr 29, 2004 12:16 pm    Post subject: Re: About TCP port with Indy You may want to provide a snippet from your source code showing how you configured the socket. Also, is there a firewall on your network, possibly blocking inbound connections? Charles "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote Quote: Hi Indy team, I have a question, I build a TCP server, for example, a SMTP server with TIdSMTPServer and run it, and in another computer I connect to this SMTP server with telnet command as: telnet *.*.*.* 25 Yes, I can connect to it. But if I change the SMTP server port from 25 to another value, such as 26, and the other computer is in the different IP section(other ISP), I can not connect to the SMTP server with the command: telnet *.*.*.* 26 but if change the bind port to 25, works well. Why? Thanks David Back to top David Guest Posted: Thu Apr 29, 2004 4:56 pm    Post subject: Re: About TCP port with Indy Yes, I install Norton Internet Security in my computer, but when I tested it, I stopped the firewall, same result, anybody can tell me why? Why port 25 is ok, but other can not? Thanks "Charles Stack" <charles> wrote Quote: You may want to provide a snippet from your source code showing how you configured the socket. Also, is there a firewall on your network, possibly blocking inbound connections? Charles "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote in message news:4090aca9$1 (AT) newsgroups (DOT) borland.com... Hi Indy team, I have a question, I build a TCP server, for example, a SMTP server with TIdSMTPServer and run it, and in another computer I connect to this SMTP server with telnet command as: telnet *.*.*.* 25 Yes, I can connect to it. But if I change the SMTP server port from 25 to another value, such as 26, and the other computer is in the different IP section(other ISP), I can not connect to the SMTP server with the command: telnet *.*.*.* 26 but if change the bind port to 25, works well. Why? Thanks David Back to top Remy Lebeau (TeamB) Guest Posted: Thu Apr 29, 2004 7:55 pm    Post subject: Re: About TCP port with Indy "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote Quote: Why port 25 is ok, but other can not? Is the server actually listening on port 26 to begin with? When exactly did you change the port? Was it at design-time, or at runtime? Gambit Back to top David Guest Posted: Fri Apr 30, 2004 1:16 am    Post subject: Re: About TCP port with Indy I changed the port to 26, then restarted the program. I have tried port 25,26,23,21, etc., but all failed except port 25. If I tried the same test in local network with same IP range, all worked well, but if in another network, for example, the other computer connect to the internet via another ISP, only port 25 could be connected with telnet command. Are there any special setting in TidTCPServer or TIdSMTPServer? Thanks "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote in message news:409131b7 (AT) newsgroups (DOT) borland.com... Why port 25 is ok, but other can not? Is the server actually listening on port 26 to begin with? When exactly did you change the port? Was it at design-time, or at runtime? Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Fri Apr 30, 2004 7:14 pm    Post subject: Re: About TCP port with Indy "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote Quote: I changed the port to 26, then restarted the program. That is not what I asked. Is the port set to 26 BEFORE or AFTER you set the server's Active property to true? Again, I ask.. when EXACTLY are you setting the port to 26? Quote: I have tried port 25,26,23,21, etc., but all failed except port 25. That doesn't tell me anything without knowing the specifics of when and how you are setting the port to begin with. Quote: If I tried the same test in local network with same IP range, all worked well, but if in another network, for example, the other computer connect to the internet via another ISP, only port 25 could be connected with telnet command. Then that suggests a firewall or router is probably involved somewhere on the network blocking the ports. Gambit Back to top David Guest Posted: Sat May 01, 2004 3:10 am    Post subject: Re: About TCP port with Indy Hi Gambit, Thank you very much for your reply. I set the port to 26 before I set the server's Active property to true. The process of setting the server's Active property to true is in the main form oncreate event, so I first set the port to 26, then close the program, then start the program, now I think that the port of server is 26. Another case, if I set the port to 110, the program can connect the server(TIdSMTPServer) from outside network computer, but if I send email to the server(TIdSMTPServer), after the "DATA" command, the server can only received the first line of email(the first line of header), but in the client program, the all data of the mail have been sent out include the command '.', but the server received nothing except the first line and then waiting.... I'm not sure what difference between port 25 and port 110, they are all TCP/IP port, but it seems that the port 110 will capture the data. Can you tell me why? Thanks "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote in message news:4091a6e5$1 (AT) newsgroups (DOT) borland.com... I changed the port to 26, then restarted the program. That is not what I asked. Is the port set to 26 BEFORE or AFTER you set the server's Active property to true? Again, I ask.. when EXACTLY are you setting the port to 26? I have tried port 25,26,23,21, etc., but all failed except port 25. That doesn't tell me anything without knowing the specifics of when and how you are setting the port to begin with. If I tried the same test in local network with same IP range, all worked well, but if in another network, for example, the other computer connect to the internet via another ISP, only port 25 could be connected with telnet command. Then that suggests a firewall or router is probably involved somewhere on the network blocking the ports. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat May 01, 2004 4:15 am    Post subject: Re: About TCP port with Indy "David" <pangtat2000 (AT) yahoo (DOT) com.cn> wrote Quote: I set the port to 26 before I set the server's Active property to true. The process of setting the server's Active property to true is in the main form oncreate event, so I first set the port to 26, then close the program, then start the program, now I think that the port of server is 26. If you run a program like netstat after activating the server, does it say that port 26 is actually in use? Quote: Another case, if I set the port to 110 Port 110 is typically used for POP3, not SMTP. Quote: the program can connect the server(TIdSMTPServer) from outside network computer, but if I send email to the server(TIdSMTPServer), after the "DATA" command, the server can only received the first line of email(the first line of header), but in the client program, the all data of the mail have been sent out include the command '.', but the server received nothing except the first line and then waiting.... That still suggests that you have something on the network blocking/intercepting the data traffic between the client and server. Gambit Back to top Charles Stack Guest Posted: Sat May 01, 2004 1:38 pm    Post subject: Re: About TCP port with Indy Per chance, is he running XP and have the built-in firewall enabled? Quote: That still suggests that you have something on the network blocking/intercepting the data traffic between the client and server. Back to top David Guest Posted: Sun May 09, 2004 12:02 pm    Post subject: Re: About TCP port with Indy Yes, my OS is XP, but the built-in firewall has been disabled. "Charles Stack" <charles> wrote Quote: Per chance, is he running XP and have the built-in firewall enabled? That still suggests that you have something on the network blocking/intercepting the data traffic between the client and server. 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