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Site-toSite VPN cannot access XG on remote site using normal 4444 port.

I have set up a iPsec VPN between 2 sites (Site A 192.168.99.x, Site B 192.168.1.x)

The VPN works fine and I can access servers on SITE B from SITE A via RDP connections using local IP's

However If I try to access the XG device at SITE B (https://192.168.1.3:4444) from SITE A it will not connect. - I have also found other connections on SITE B are also not found including the Sophos Firewall Manger device (hardware). I can ping these device with no problem from SITE A -> SITE B - very strange ?

 

Running ( XG210 (SFOS 17.1.1 MR-1) )



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  • XG 210 itself, Synology NAS, Sophos Firewall Manager. (XG125 on branch office A)

  • Hi,

    Did you solved your issue ?

    I've the same problem.

     

    Thanks in advance,

    Ludo.

  • Nope - I logged a case with tech support and it has been escalated right up to senior support - I have spent many hours on remote sessions but still no solution !!

     

    It only seems to be when the WAN connection to the ISP is STATIC - if it is PPoe then all works fine.

  • Hello,

    Which IPSEC policy was used? Did you enable data compression?

    I had the problem once before. Servers were available. Ping went too but I could not open the web interface of the XG (TLS handshake timeout) and traceroute did not work either.

    It can be checked relatively quickly whether you can open the XG with Internet Explorer.

    best regards,

    Pascal

    IT-SECURITY CONSULTANT 

    Certified Architect - XG | UTM | MOBILE 

  • Hello,

    Thanks for your reply.

    I use the DefaultBranchOffice Ipsec profile. (and DefaultHeadOffice on my central Sophos XG)

    In SFOS16 DefaultBranchOffice IPSec Profile, the compression is ON.

    Not in SFOS17.

    Do you think I have to test with the compression ON ?

    Because in SFOS16, we don't have this Admin Login Page access problem.

    Problem is the same with IE or Firefox.

     

    Thanks in advance.

    Ludo.

  • We used default Headoffice/Branch office policies. 

    Did you solve this using data compression ?

  • So in my case it looked like this.

    Without compression

    With compression

    best regards,

    Pascal

    IT-SECURITY CONSULTANT 

    Certified Architect - XG | UTM | MOBILE 

  • Maybe i can provide some kind of Workaround.

     

    Let me paint the picuture.

     

    Client with Browser - Router - Ipsec Tunnel - XG - Webadmin Interface(192.168.190.1/24)

     

     

    On The Router (SG / XG / Whatever), i apply following iptables command. 

    iptables -t mangle -I POSTROUTING -d 192.168.190.1/32 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 900
    
     

    __________________________________________________________________________________________________________________

  • Hi,

     

    It's seems to work when I apply a 900 MSS on the LAN Interface.

     

    So now, what's the impact on the trafic or anything else if I let this like that ?

     

    Thanks.

    Ludo.