Is Port 135 required to establish a PPTP connection?

[Guest]

Hi

Is Port 135 required at any point to establish a PPTP connection. When the connection is being made a port 135 packet is sent over the internet. Our ISP disconnects your internet connection if they detect Port 135 traffic. We've blocked Port 135 at the firewall, but are unable to establish a tunnel afterwards. We find we also require ICMP traffic to be unblocked to be able to establish the tunnel. Should this be the case?

 

[Chetan Raghavendra [MSFT]]

Hi Mark,

Ports needed for VPN
PPTP - TCP port 1723 and IP Protocol 47 (GRE)
L2TP - if used with IPSEC: protocol 50 (ESP) and UDP 500, without IPSEC: UDP
1701

As you see with Microsoft implementation, we wouldn't require port 135.

RPC listens on port 135 and PPTP doesnt require RPC.


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Thanks
Chetan
(e-mail address removed)

This posting is provided "AS IS" with no warranties, and confers no rights.

Hi

Is Port 135 required at any point to establish a PPTP connection. When

the connection is being made a port 135 packet is sent over the internet.
Our ISP disconnects your internet connection if they detect Port 135
traffic. We've blocked Port 135 at the firewall, but are unable to
establish a tunnel afterwards. We find we also require ICMP traffic to be
unblocked to be able to establish the tunnel. Should this be the case?

 

[Mark Barnes]

Cheers for the reply.

What about ICMP, if that is being blocked would a tunnel
not create?

 

[Marc Reynolds [MSFT]]

No, you don't need ICMP to be able to create a VPN tunnel.

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Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.