VPN disconnects after short time

Macbook Pro OSX 10.9.5

I'm setting up a VPN connection, but can only stay connected for a few minutes at a time at the most. I know other users are able to stay connected to this VPN.

Here is the final portion of the log showing the failure:

Tue Dec 15 17:33:23 2015 : pptp_wait_input: Address added. previous interface setting (name: en0, address: 10.0.1.7), current interface setting (name: ppp0, family: PPP, address: 10.1.1.129, subnet: 255.255.255.0, destination: 10.1.1.1).

Tue Dec 15 17:33:26 2015 : PPTP port-mapping update for en0 ignored: VPN is the Primary interface. Public Address: 0, Protocol: None, Private Port: 0, Public Port: 0

Tue Dec 15 17:33:26 2015 : PPTP clearing port-mapping for en0

Tue Dec 15 17:36:57 2015 : rcvd [LCP TermReq id=0x3 "MPPE disabled"]

Tue Dec 15 17:36:57 2015 : LCP terminated by peer (MPPE disabled)

Tue Dec 15 17:36:57 2015 : ipcp: down

Tue Dec 15 17:36:57 2015 : sent [LCP TermAck id=0x3]

Tue Dec 15 17:36:57 2015 : pptp_wait_input: Address deleted. previous interface setting (name: en0, address: 10.0.1.7), deleted interface setting (name: ppp0, family: PPP, address: 10.1.1.129, subnet: 255.255.255.0, destination: 10.1.1.1).

Tue Dec 15 17:36:57 2015 : rcvd [LCP TermReq id=0x4 "MPPE disabled"]

Tue Dec 15 17:36:57 2015 : sent [LCP TermAck id=0x4]

Tue Dec 15 17:36:57 2015 : PPTP error when reading socket : EOF

Tue Dec 15 17:36:57 2015 : PPTP error when reading header : read -1, expected 12 bytes

Tue Dec 15 17:36:57 2015 : Connection terminated.

Tue Dec 15 17:36:57 2015 : PPTP clearing port-mapping for en0

Tue Dec 15 17:36:57 2015 : Connect time 3.7 minutes.

Tue Dec 15 17:36:57 2015 : Sent 760479 bytes, received 4145998 bytes.

Tue Dec 15 17:36:57 2015 : PPTP disconnecting...

Tue Dec 15 17:36:57 2015 : PPTP disconnected