Hi, Until recently my site to site VPN between USG 110 and USG FLEX 100 using firmware 4.62 have no problem connecting and both sites can be easily access each other for the last 6 months. The USG FLEX 100 was recently updated to firmware v5.0. Now both sites cannot connect. The USG FLEX 100 make use of ddns address and the USG 110 use a static address. I have tested the connections with no firewalls as well as not running any NAT, it still cannot connect. Anyone have any idea what has happen?

Hi @Hoongks, Can you provide me temporarily remote access with an admin account both for USG110 and USG FLEX 100 and send me by private message? I would like to check that symptom for you.

Hi @Hoongks, I can't access the gateways that you provide me by private message. Could you please check if remote access was configured properly?

Hi @Hoongks, After re-configuring site-to-site VPN, it works now as expected.

/* * These styles apply ONLY to the header and footer assets. */ * { padding: 0; margin: 0; box-sizing: border-box; } .footer { background: #545454; color: #cdcdcd; font-size: 14px; line-height: 1.5; padding: 18px 0; } .footer-wrap { padding-left: 18px; padding-right: 18px; max-width: 1236px; margin: 0 auto; } .footer a { color: #cdcdcd; text-decoration: none; } .footer a:hover { color: #cdcdcd; text-decoration: none; } .footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; margin: -3px; } .footer-col { padding: 0 3px; } .footer-col-copyRight { justify-content: flex-start; } .footer-col-logo { justify-content: flex-end; } .footer-col-logo a { margin-right: 10px; } .footer-col-copyRight, .footer-col-logo { flex: 1; display: flex; } .logo { width: 120px; height: 28px; opacity: 0.6; } @media screen and (max-width: 768px) { .footer-row { display: block; } .footer-col { width: 100%; text-align: center; margin: 6px 0; } .footer-col:first-child { margin-top: 0; } .footer-col:last-child { margin-bottom: 0; } .footer-col-copyRight, .footer-col-logo { justify-content: center; } .logo { margin: 0 auto; } } /*# sourceMappingURL=styles.css.map */ <iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KSB6LQH" height="0" width="0" style="display:none;visibility:hidden"></iframe>

Site to site VPN breakdown after updating to firmware version 5

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/* * These styles apply ONLY to the header and footer assets. */ * { padding: 0; margin: 0; box-sizing: border-box; } .footer { background: #545454; color: #cdcdcd; font-size: 14px; line-height: 1.5; padding: 18px 0; } .footer-wrap { padding-left: 18px; padding-right: 18px; max-width: 1236px; margin: 0 auto; } .footer a { color: #cdcdcd; text-decoration: none; } .footer a:hover { color: #cdcdcd; text-decoration: none; } .footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; margin: -3px; } .footer-col { padding: 0 3px; } .footer-col-copyRight { justify-content: flex-start; } .footer-col-logo { justify-content: flex-end; } .footer-col-logo a { margin-right: 10px; } .footer-col-copyRight, .footer-col-logo { flex: 1; display: flex; } .logo { width: 120px; height: 28px; opacity: 0.6; } @media screen and (max-width: 768px) { .footer-row { display: block; } .footer-col { width: 100%; text-align: center; margin: 6px 0; } .footer-col:first-child { margin-top: 0; } .footer-col:last-child { margin-bottom: 0; } .footer-col-copyRight, .footer-col-logo { justify-content: center; } .logo { margin: 0 auto; } } /*# sourceMappingURL=styles.css.map */

Site to site VPN breakdown after updating to firmware version 5

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