Huge Problem with Ports C80 Router totally useless like this

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Huge Problem with Ports C80 Router totally useless like this
Huge Problem with Ports C80 Router totally useless like this
2021-02-13 19:54:17 - last edited 2021-06-09 06:37:14
Model: Archer C80
Hardware Version: V1
Firmware Version: 1.5.0

I have a now router the c80.

 

If i try to forward PORT 1701 for VPN, it tells me "Conflicting with existing port: 1701. To avoid conflict, please enter another value."

 

Please help me and all the other ppl with the same Problem.

 

Like this, the router is useless and i need to send it back.

 

 

SOLUTION:

I made a few times the Factory reset with the same settings all the time.

Now it still brings the error, but the Port is open.

 

HERE my Settings!

 

 

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#1
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2 Accepted Solutions
Re:Huge Problem with Ports C80 Router totally useless like this-Solution
2021-02-18 20:14:52 - last edited 2021-06-09 06:37:14

@Kevin_Z  its working now.

I have no idea what was wrong but i made the factory restore like 5 Times and now it works.

Havent changed anything. 

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#16
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Re:Huge Problem with Ports C80 Router totally useless like this-Solution
2021-07-21 02:44:17 - last edited 2021-07-21 02:44:21

Hello @SharkIT and all,

 

Check the solution we updated here:

[Solution] Cannot open 1701 port on Archer C80

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#26
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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-13 20:16:54 - last edited 2021-04-10 05:42:34

@felixk 

 

Try turning this on and test if the port 1701 for L2TP is open.

 

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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-13 20:18:40

@Ivaylo it es already on and not working.

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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-13 20:19:32 - last edited 2021-04-10 05:49:02

Toggle the switch off/on and try again to see if the port is open.

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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-13 20:21:14

@Ivaylo still same problem. i also checked all the other options to turn them on and off.

 

still: 

Conflicting with existing port: 1701. To avoid conflict, please enter another value.

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#5
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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-13 21:00:05 - last edited 2021-02-14 01:16:05

Check this link - that maybe the reason you can't open 1701 UDP port on the router.

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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-15 09:44:45

@felixk 

Hi, May I know why do you want to enable port 1701? Was there any L2TP VPN server behind the C80?

Would it work if we open the DMZ for the L2TP host?

Just confirming, no matter which port opened for the UDP protocol for the L2TP host, the error message would show up, right?

Thank you very much and wait for your reply.

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#7
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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-17 23:50:12

@Ivaylo i dont know whta you want to tell me. 

Its just a Problem with this router. If i use my old Archer C6 i can open all the ports is want.

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#8
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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-18 00:01:22

@Kevin_Z Yes, i have a synology behind and i want to use it as an VPN Server. L2TP.

It was working perfect with my old tp link Archer c6.

 

If i open DMZ für the host it still tells me "Conflicting with existing port: 1701. To avoid conflict, please enter another value." when i try to add 1701.

 

I hope you have a solution soon, i need to send the router back and write a Review, so that no one else falls for this :(

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#9
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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-18 00:17:18

@felixk 

 

Kevin's idea was to setup DMZ to the host in question, try to establish a VPN connection and see if it works (without trying to open the 1701 port).

 

What I wanted to point out is the following paragraph from the link posted:

" When the process is complete, L2TP packets between the endpoints are encapsulated by IPsec. Since the L2TP packet itself is wrapped and hidden within the IPsec packet, the original source and destination IP address is encrypted within the packet. Also, it is not necessary to open UDP port 1701 on firewalls between the endpoints, since the inner packets are not acted upon until after IPsec data has been decrypted and stripped, which only takes place at the endpoints. "

 

It could be an issue with that particular router model, but I think it was worth mentioning that.

 

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Re:Huge Problem with Ports C80 Router totally useless like this
2021-02-18 00:20:16

@Ivaylo i have done it and it is not working. No VPN Connection.

 

It must be a problem with exactly this router, cause with the old one it works perfect, with all kind of fritzbox it works.

Must be something with just this model.

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