No internet connection in SENSE Router's guest network after firmware update version 1.7.104.20

header {margin:52px 0 0 0} #dropdownnavi {float:left; clear:both; margin: -2px 0 20px -12px;} header .row {width:100%} header .row:nth-child(1) {background-color:#0014a0} header .container, footer .container {max-width:1172px; margin: auto;} .top-header {height:53px;} .bottom-header {height:52px;} .Header-logo {width: 10%;float: left;} .Header-logo img {width: 105px; margin: 11px 8px 8px 16px;} .header-top-links {float: right; margin: 1px 29px 0 0;} .header-top-link, .header-bottom-item {cursor: pointer; display: inline-block; font-size: 14px; font-weight: 400; line-height: 52px; margin: 0 15px; position: relative; text-align: center; } .header-top-link, .header-bottom-item a {text-decoration:none;} .header-top-link {color: #fff; margin: 0 10px 0 12px;} .header-top-link.active {margin-right:12px} .header-top-link.active::after {width: calc(100% + 30px)!important} .header-top-link.active::after, .header-top-link:hover::after {background: #fff;} .header-bottom-link {color: #1e1e1e;} .header-bottom-item .header-bottom-link {margin:0 15px} #homeLink {margin-left:1px} .kb-lang-title {width:100%;text-align:center;font-weight:600;color:black; margin:0} .header-right {float: right; margin: 10px 48px 0 0; padding: 3px; height: 30px; border-radius: 3px;} #signin {margin-top:5px} #signin a {text-decoration: none; color:#1e1e1e; } .signin-icon {float: left; height: 20px; padding: 0 5px 20px 0;} #profiledropdown {padding: 2px; border-radius: 3px; margin-top: -3px;} #profiledropdown:hover {cursor:pointer; background-color:#0014a0} #profilename #profileicon {background: #dfdfdf; border-radius: 25px; width: 28px; height: 28px;} #profile-menu ul {list-style: none; padding-left:0} #profile-menu ul li {padding:10px 0 10px 20px;font-size: 15px;} #profile-menu ul li:hover, #articleslink p:hover, #dashboardlink p:hover {cursor:pointer; background-color:#efefef;} #profile-menu ul li a {text-decoration:none; color:#1e1e1e} #profile-menu hr {border:1px solid #efefef} #articleslink hr, #dashboardlink hr {margin:0} #articleslink .title {padding: 0;text-align: center; font-weight: 600;} #articleslink p, #dashboardlink p {padding:10px 0 10px 20px;} #articleslink p a, #dashboardlink p a {text-decoration: none; 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max-height: 32px; width: auto; margin-top:20px} .Footer .col {padding:0 0 0 15px;width: 20%; font-size: 13px; display: table-cell; vertical-align: top;} .Footer .footer-links-wrap {padding-bottom: 15px; border-bottom: 1px solid #c4c4c4;} .Footer .footer-links-wrap .col:nth-child(2), .Footer .footer-links-wrap .col:nth-child(3), .Footer .footer-links-wrap .col:nth-child(4) {border-right:1px solid #c4c4c4} .Footer .col ul {list-style: none;} .Footer .col:nth-child(2) ul {padding: 0;} .Footer .col ul li a {color: #1e1e1e; text-decoration: none;} .footer-link-title {text-transform: uppercase; color: #1e1e1e;} .footer-link-subtitle {font-size:14px; color: #1e1e1e; max-width:95%} .footer-icon {float: left; height: 30px; padding: 0 10px 60px 0;} .col-copyRight a, .social-icons-wrap a {display:inline-block; padding:5px 0; text-decoration: none; color: #1e1e1e; } .social-icons-wrap {float:right} .Footer a:hover, .Footer .col ul li a:hover {color:#0014a0} footer.Footer .row.bottom-row {padding-top:5px} footer.Footer .row.bottom-row .col.col-copyRight * {font-weight:400} social-link:hover {cursor:pointer} social-link:hover svg {fill:#0014a0} #signin .header-bottom-item.header-bottom-link {display:inline-block; margin-top: -16px;} #signin a:hover {color:#0014a0} @media screen and (max-width:991px){ header {margin:0} header .row:nth-child(1) {height:64px} .Header-logo img {margin: 17px 8px 8px 16px;} .Hamburger-border {position: absolute; right: 60px; border-left: 1px solid #fff; height: 64px; width: 50px; top: 0; z-index: 20; border-right: 1px solid white; padding-right: 10px;} .Hamburger {display:block;position: absolute; top: 8px; left: calc(100% - 52px); z-index: 20;-webkit-box-align: center; -webkit-box-pack: center;-webkit-user-select: none; align-items: center; background: transparent; border: none; border-radius: 0;cursor: pointer;justify-content: center; outline: none;transition: .35s;} .Hamburger-menuXcross {height: 25px; padding: 0; width: 26px;} .Hamburger-menuLines {-o-transition: .35s;-webkit-transition: .35s; background-color: #fff; border-radius: 2px; display: inline-block; height: 2px; position: relative; transition: .35s; width: 26px;} .Hamburger-menuLines::before {top: 6px; } .Hamburger-menuLines::after {top: -6px;} .Hamburger-menuLines::after, .Hamburger-menuLines::before {-ms-transform-origin: 5.5px center;-o-transition: .35s;-webkit-transform-origin: 5.5px center;-webkit-transition: .35s;background-color: #fff;border-radius: 2px; content: ""; display: inline-block; height: 2px;left: 0;position: absolute;transform-origin: 5.5px center;transition: .35s;width: 26px;} .sr-only {position: absolute !important;width: 1px !important;height: 1px !important;padding: 0 !important;margin: -1px !important;overflow: hidden !important;clip: rect(0,0,0,0) !important;border: 0 !important;} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::before {-webkit-transform: rotate(45deg); transform: rotate(45deg);} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::after {-webkit-transform: rotate(-45deg);transform: rotate(-45deg);} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::after, .Hamburger-menuXcross.isToggled .Hamburger-menuLines::before {-ms-transform-origin: 50% 50%;-webkit-transform-origin: 50% 50%;background-color: hsla(0,0%,100%,.6); left: 0;top: 0;transform-origin: 50% 50%;width: 26px;} .Hamburger-menuXcross.isToggled .Hamburger-menuLines {background: transparent;} .isToggled .Hamburger-menuLines {-webkit-transform: scaleX(1);transform: scaleX(1);} #signin {text-align:center; margin: auto; color:white} #signin a {text-decoration: none; color:white;} .header-top-links, .bottom-header {display: none} .header-coveosearch {margin-top:0} .header-searchcontainer {color: white; text-align: right; margin: 8px 18px 0 0;} .header-search { padding: 11px 0 0 0; width: 60px; margin: auto; display: block; position: absolute; right: 17px; top: 8px;} .searchboxtoggle {color:white} .header-searchbox {position: absolute; right: 60px; top: 0; width: 300px;} #kbsearch {height:66px} .banner-middleContainer_f1l0wf96 {box-shadow: inset 0 10px 10px -10px #000;} #homeLink, #helpForumsLink, #FaqsLink, #userguidesLink, #supportLink, .header-right {width:100%; text-align: left; margin: 0; } #userguidesLink, #supportLink {border-top: 1px solid #dfdfdf;} #helpForumsLink, #FaqsLink {margin: 0 0 10px 25px;} .top-header-link {text-transform: uppercase; font-weight:700; color:#1e1e1e; font-size:14px; padding:15px 15px; line-height: 2em;} #dropdownnavi .top-header-link {margin: 3px 0 0 10px;} .header-bottom-link::after {background:none;} .header-bottom-item .header-bottom-link {margin:0 10px} .depth-1-list, .depth-2-list, .depth-3-list {list-style: none; margin: 0; padding:0 0 0 40px} .kb-lang-title {text-align:left;} #menu-dropdown {margin-top: -20px;} #kb-menu-dropdown .depth-2-list.open {padding-left:30px} .depth-1-list a, .depth-2-list a, .depth-3-list a {color:#1e1e1e} .smdropdown-alt {line-height: 0; margin:0 padding: 0 0 10px 0;} .smdropdown-link {color:#acacac!important; font-style: italic;} .depth-1-list, .depth-2-list, .depth-3-list {display: none; margin: -20px 0 20px 0; padding: 0 0 0 15px;} .header-right {float: right;padding: 8px 0; height: 30px; border-radius: 0; box-shadow: 0 3px 5px #1e1e1e; background:#0014a0; text-align: right;} #profiledropdown {width: 30px; float: right; margin-right: 40px} #profiledropdown:hover {background: none} #profiledropdown:hover #profile-menu {display: none} #profileicon {margin-top:2px} #profile-menu {display: none; position: absolute; left: 5%; background: white; width: 90%; text-align: left; z-index: 400; border: 1px solid #dfdfdf; border-radius: 3px; box-shadow: 0 5px 5px #dedede;} .open {display: block;} .Footer .col {display: block; width:90%; padding: 0 20px 15px 20px} .Footer .col.col-copyRight, .Footer .col.col-social {width:90%} footer .container {width:95%} .col.footer-logo-wrap {text-align: center;} .col-copyRight a, .social-icons-wrap a {padding: 10px 0 0 0;} .Footer .footer-links-wrap .col:nth-child(2), .Footer .footer-links-wrap .col:nth-child(3), .Footer .footer-links-wrap .col:nth-child(4) {border-bottom:1px solid #c4c4c4; border-right:none} a.dropdown-1-title, a.dropdown-2-title, a.dropdown-3-title {color: #8a8a8a; font-style: italic;} .signin-icon {display: none;} #signin .header-bottom-item.header-bottom-link {margin-top: -10px;} } @media screen and (min-width:992px){ .Hamburger, .dropdownnavi .top-header-link, #userguidesLink, #supportLink, .smdropdown-alt {display: none;} .bottom-header {display: block;} .header-top-link::after {background: #fff;} header .row:nth-child(2) {background-color:white; box-shadow: 0 3px 5px rgba(0,0,0,0.1);} .depth-1-list, .depth-2-list, .depth-3-list {list-style: none; margin: 0; padding-left: 0; box-shadow: 0 4px 4px rgba(0,0,0,.1);} .depth-1-item, .depth-2-item, .depth-3-item {padding-left:15px; border-bottom:1px solid #dfdfdf; position: relative;} .depth-1-item a, .depth-2-item a, .depth-3-item a {color: #1e1e1e;} .header-bottom-link::after {background: #0014a0;} .header-top-link.active::after, .header-top-link:hover::after, .header-bottom-link.active::after, .header-bottom-link:hover::after {bottom: 0; content: ""; display: block; height: 5px; left: -15px; margin: auto; position: absolute; width: calc(100% + 35px);} .header-bottom-link.smdropdown:hover, .header-bottom-link.smdropdown.active {color:#0014a0} .header-searchbox {position:absolute;top:0;right:60px; margin:0; z-index: 200; } .header-searchbox.active {width:500px;transition: 1s ease-in-out;} #kbsearch {width:350px;} #menu-dropdown, #kb-menu-dropdown {position: absolute; z-index: 100; background: white; text-align: left; margin: 1px 0 0 -15px;} #menu-dropdown, #kb-menu-dropdown .depth-1-list {width:280px} #kb-menu-dropdown .depth-2-list {width:350px!important} #profile-menu {position: absolute; z-index: 100; background: white; width: 350px; text-align: left; width:260px; margin: 0 0 0 -230px; border: 1px solid #c4c4c4; border-radius: 5px; box-shadow: 0 4px 4px rgba(0,0,0,.1);} #menu-dropdown, #menu-dropdown .depth-2-list, #menu-dropdown .depth-3-list, #kb-menu-dropdown, #kb-menu-dropdown .depth-2-list, #profile-menu {display:none;} #helpForumsLink:hover #menu-dropdown, #FaqsLink:hover #kb-menu-dropdown, #profiledropdown:hover #profile-menu {display: block;} #menu-dropdown .depth-1-item:hover .depth-2-list, #menu-dropdown .depth-2-item:hover .depth-3-list, #kb-menu-dropdown .depth-1-item:hover .depth-2-list { display: block; left: calc(100%); background: #fff; border: 1px solid #c4c4c4; position: absolute; top: 0; width: 100%;} #kb-menu-dropdown .depth-1-url {margin:0} #menu-dropdown .depth-1-item:nth-child(3) .depth-2-list, #menu-dropdown .depth-2-item:hover .depth-3-list {top:-1px} .depth-1-item:hover, .depth-2-item:hover, .depth-3-item:hover {pointer:cursor;background-color:#f8f8f8} #helpForumsLink .depth-1-item:hover .depth-1-url, .depth-2-item:hover .depth-2-url, .depth-3-item:hover .depth-3-url, #kb-menu-dropdown .depth-2-item:hover .depth-3-url {color:#0014a0} #FaqsLink .depth-1-item:hover, #FaqsLink .depth-1-item:hover .depth-1-url {cursor:default} .header-right {float: right; 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No internet connection in SENSE Router's guest network after firmware update version 1.7.104.20 - F-Secure Community

Symptoms

After the SENSE Router firmware update in version 1.7.104.20, the internet connection in the SENSE Router guest network stopped working.

Diagnosis

This issue is due to the recent enablement of the multicasting functionality in firmware version 1.7.104.20, which causes the guest network configuration to be overwritten by a new IP table rule.

Solution

Guest network configuration needs to be re-applied.
Refer to article Can I create a guest WiFi on F-Secure SENSE Router? and create the guest network as instructed in the article. However, you need to toggle the main guest network switch off and then on again. Note that the settings must be saved after each setting change.