SpeedStream 6520 DSL Router - Port forwarding of port 25

rajeshvijayan · 10-27-2009, 06:58 AM

Hi,

I have been using an DSL Siemens speedstream 6520 router at home. I usually carry out some R&D by placing servers behind the router. I access the services on each of the servers from the ouside using port forwarding and it has been working fine for http, ftp, RDP, any user defined ports etc but in the case of port 25 SMTP its not working at all. I have checked the port on the local lan and I am able to telnet to that server but from the outside only on this port 25 I am not able to telnet. But If i were to change the SMTP port number from 25 to any other port like 24 or 26, I am able to telnet from the outide. Is there any way i can make SMTP port 25 to work and access the same from the outside.

Regards
Rajesh

**johnwill** · 10-27-2009, 09:44 AM

Answered on another board. Most likely, your ISP is blocking port 25.

10-27-2009, 06:58 AM	#1 (permalink)
rajeshvijayan Registered User Join Date: Oct 2009 Posts: 1 OS: Windows XP sp3	SpeedStream 6520 DSL Router - Port forwarding of port 25 Hi, I have been using an DSL Siemens speedstream 6520 router at home. I usually carry out some R&D by placing servers behind the router. I access the services on each of the servers from the ouside using port forwarding and it has been working fine for http, ftp, RDP, any user defined ports etc but in the case of port 25 SMTP its not working at all. I have checked the port on the local lan and I am able to telnet to that server but from the outside only on this port 25 I am not able to telnet. But If i were to change the SMTP port number from 25 to any other port like 24 or 26, I am able to telnet from the outide. Is there any way i can make SMTP port 25 to work and access the same from the outside. Regards Rajesh

10-27-2009, 09:44 AM	#2 (permalink)
johnwill Manager, Networking Forums Join Date: Sep 2002 Location: S.E. Pennsylvania, US Posts: 41,822 OS: Windows 7, XP-Pro, Vista, Linux Blog Entries: 1	Re: SpeedStream 6520 DSL Router - Port forwarding of port 25 Answered on another board. Most likely, your ISP is blocking port 25. __________________ If TSF has helped you, Tell us about it! or Donate to help keep the site up! Microsoft MVP - Windows Desktop Experience