{"id":10210,"date":"2026-09-07T00:19:16","date_gmt":"2026-09-06T17:19:16","guid":{"rendered":"https:\/\/www.ablenet.co.th\/?p=10210"},"modified":"2026-09-07T00:24:39","modified_gmt":"2026-09-06T17:24:39","slug":"error-reused-issuer-after-upgrade-firmware-cisco","status":"publish","type":"post","link":"https:\/\/www.ablenet.co.th\/en\/2026\/09\/07\/error-reused-issuer-after-upgrade-firmware-cisco\/","title":{"rendered":"\u0e2b\u0e25\u0e31\u0e07 Upgrade Firmware \u0e2b\u0e19\u0e49\u0e32 GUI Cisco Error SEC_ERROR_REUSED_ISSUER_AND_SERIAL"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u0e40\u0e1e\u0e37\u0e48\u0e2d\u0e19\u0e46\u0e17\u0e35\u0e48\u0e14\u0e39\u0e41\u0e25\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c Cisco \u0e2d\u0e32\u0e08\u0e40\u0e01\u0e34\u0e14\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e27\u0e48\u0e32 \u0e40\u0e21\u0e37\u0e48\u0e2d Upgrade Firmware \u0e02\u0e2d\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c \u0e44\u0e21\u0e48\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e40\u0e02\u0e49\u0e32\u0e2b\u0e19\u0e49\u0e32 GUI \u0e44\u0e14\u0e49 \u0e42\u0e14\u0e22\u0e21\u0e35 Error \u0e02\u0e36\u0e49\u0e19\u0e21\u0e32\u0e1c\u0e48\u0e32\u0e19 Web Browser \u0e27\u0e48\u0e32 SEC_ERROR_REUSED_ISSUER_AND_SERIAL \u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07\u0e21\u0e32\u0e08\u0e32\u0e01 Browser \u0e15\u0e23\u0e27\u0e08\u0e1e\u0e1a Certificate \u0e17\u0e35\u0e48\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e2a\u0e48\u0e07\u0e21\u0e32 \u0e21\u0e35 Issuer + Certificate \u0e17\u0e35\u0e48\u0e0b\u0e49\u0e33\u0e01\u0e31\u0e1a\u0e17\u0e35\u0e48 Browser \u0e21\u0e35 \u0e41\u0e15\u0e48\u0e04\u0e48\u0e32\u0e40\u0e0a\u0e48\u0e19 Public Key, Fingerprint \u0e2b\u0e23\u0e37\u0e2d\u0e0a\u0e48\u0e27\u0e07\u0e40\u0e27\u0e25\u0e32 Validity \u0e44\u0e21\u0e48\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19\u0e01\u0e31\u0e19 \u0e17\u0e33\u0e43\u0e2b\u0e49 Browser \u0e21\u0e2d\u0e07\u0e27\u0e48\u0e32\u0e2d\u0e31\u0e19\u0e15\u0e23\u0e32\u0e22 \u0e08\u0e36\u0e07\u0e44\u0e21\u0e48\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e43\u0e2b\u0e49\u0e1c\u0e48\u0e32\u0e19\u0e44\u0e14\u0e49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e42\u0e14\u0e22\u0e40\u0e23\u0e32\u0e08\u0e30\u0e21\u0e32\u0e41\u0e01\u0e49\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e42\u0e14\u0e22\u0e01\u0e32\u0e23 RSA key pair \u0e43\u0e2b\u0e21\u0e48 + Trustpoint \u0e43\u0e2b\u0e21\u0e48 + Self-signed Certificate \u0e43\u0e2b\u0e21\u0e48 \u0e02\u0e2d\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e41\u0e25\u0e30\u0e19\u0e33\u0e44\u0e1b\u0e43\u0e0a\u0e49\u0e01\u0e31\u0e1a https \u0e04\u0e23\u0e31\u0e1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e42\u0e14\u0e22\u0e0a\u0e38\u0e14\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07\u0e17\u0e31\u0e49\u0e07\u0e2b\u0e21\u0e14 \u0e08\u0e30\u0e21\u0e35\u0e1b\u0e23\u0e30\u0e21\u0e32\u0e13\u0e19\u0e35\u0e49\u0e04\u0e23\u0e31\u0e1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>configure terminal\n\nno ip http secure-server\n\ncrypto key zeroize rsa\n\ncrypto key generate rsa label &lt;any key name here&gt; modulus 2048\n\ncrypto pki trustpoint &lt;Trustpoint_Name&gt;\n\nenrollment selfsigned\n\nrsakeypair &lt;key label name from above&gt;\n\nexit\n\ncrypto pki enroll &lt;trustpoint name&gt;\n\nip http secure-trustpoint &lt;trustpoint name&gt;\n\nip http secure-server\n\nend\n\nwrite memory\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u0e1b\u0e34\u0e14 https<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>no ip http secure-server<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e17\u0e33\u0e43\u0e2b\u0e49\u0e40\u0e23\u0e32\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e08\u0e31\u0e14\u0e01\u0e32\u0e23 certificate\/key \u0e42\u0e14\u0e22\u0e17\u0e35\u0e48 HTTPS server \u0e44\u0e21\u0e48\u0e01\u0e33\u0e25\u0e31\u0e07\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19\u0e02\u0e2d\u0e07\u0e40\u0e14\u0e34\u0e21\u0e2d\u0e22\u0e39\u0e48<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"367\" height=\"55\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/2026-08-26-11-47-45.mkv_20260906_215630.587.jpg\" alt=\"\" class=\"wp-image-10211\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/2026-08-26-11-47-45.mkv_20260906_215630.587.jpg 367w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/2026-08-26-11-47-45.mkv_20260906_215630.587-300x45.jpg 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/2026-08-26-11-47-45.mkv_20260906_215630.587-18x3.jpg 18w\" sizes=\"(max-width: 367px) 100vw, 367px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u0e25\u0e1a RSA key pair \u0e40\u0e14\u0e34\u0e21<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>crypto key zeroize rsa<\/code> <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certificate \u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a HTTPS \u0e21\u0e35 Public Key \u0e17\u0e35\u0e48\u0e2a\u0e31\u0e21\u0e1e\u0e31\u0e19\u0e18\u0e4c\u0e01\u0e31\u0e1a Private Key \u0e1a\u0e19 Router \u0e14\u0e31\u0e07\u0e19\u0e31\u0e49\u0e19\u0e16\u0e49\u0e32 key \u0e40\u0e01\u0e48\u0e32\u0e40\u0e01\u0e34\u0e14\u0e1c\u0e34\u0e14\u0e1b\u0e01\u0e15\u0e34 \u0e44\u0e21\u0e48\u0e2a\u0e31\u0e21\u0e1e\u0e31\u0e19\u0e18\u0e4c\u0e01\u0e31\u0e1a certificate \u0e2b\u0e23\u0e37\u0e2d\u0e21\u0e35 state \u0e17\u0e35\u0e48\u0e44\u0e21\u0e48\u0e16\u0e39\u0e01\u0e15\u0e49\u0e2d\u0e07\u0e2b\u0e25\u0e31\u0e07 upgrade \u0e01\u0e32\u0e23\u0e2a\u0e23\u0e49\u0e32\u0e07\u0e43\u0e2b\u0e21\u0e48\u0e08\u0e30\u0e15\u0e31\u0e14\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e40\u0e14\u0e34\u0e21\u0e2d\u0e2d\u0e01<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"181\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1024x181.png\" alt=\"\" class=\"wp-image-10212\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1024x181.png 1024w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-300x53.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-768x136.png 768w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-18x3.png 18w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image.png 1433w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3.  \u0e2a\u0e23\u0e49\u0e32\u0e07 RSA Key (Public &#8211; Private Key \u0e43\u0e2b\u0e21\u0e48)<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>crypto key generate rsa label HTTPS-KEY modulus 2048<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"181\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1-1024x181.png\" alt=\"\" class=\"wp-image-10213\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1-1024x181.png 1024w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1-300x53.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1-768x136.png 768w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1-18x3.png 18w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-1.png 1431w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u0e2a\u0e23\u0e49\u0e32\u0e07 Trustpoint \u0e43\u0e2b\u0e21\u0e48<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>crypto pki trustpoint HTTPS-TP\nenrollment selfsigned\nrsakeypair HTTPS-KEY<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Certificate \u0e17\u0e35\u0e48\u0e2d\u0e22\u0e39\u0e48\u0e43\u0e19 <code>HTTPS-TP<\/code> \u0e08\u0e30\u0e40\u0e1b\u0e47\u0e19 Self-Signed Certificate \u0e41\u0e25\u0e30\u0e43\u0e0a\u0e49 RSA key \u0e0a\u0e37\u0e48\u0e2d <code>HTTPS-KEY<\/code><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"629\" height=\"331\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-3.png\" alt=\"\" class=\"wp-image-10215\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-3.png 629w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-3-300x158.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-3-18x9.png 18w\" sizes=\"(max-width: 629px) 100vw, 629px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">5. \u0e2a\u0e23\u0e49\u0e32\u0e07 Certificate \u0e43\u0e2b\u0e21\u0e48<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>crypto pki enroll<\/code><\/pre>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"628\" height=\"157\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-4.png\" alt=\"\" class=\"wp-image-10216\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-4.png 628w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-4-300x75.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-4-18x5.png 18w\" sizes=\"(max-width: 628px) 100vw, 628px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">6. \u0e2a\u0e23\u0e49\u0e32\u0e07 Certificate \u0e43\u0e2b\u0e21\u0e48<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>ip http secure-trustpoint<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e27\u0e25\u0e32 Web Server \u0e40\u0e1b\u0e34\u0e14 HTTPS \u0e43\u0e2b\u0e49\u0e43\u0e0a\u0e49 Certificate \u0e08\u0e32\u0e01 HTTPS-TP<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"609\" height=\"42\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-5.png\" alt=\"\" class=\"wp-image-10217\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-5.png 609w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-5-300x21.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-5-18x1.png 18w\" sizes=\"(max-width: 609px) 100vw, 609px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">7. \u0e40\u0e1b\u0e34\u0e14 https \u0e43\u0e2b\u0e21\u0e48<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>ip http secure-server<\/code><\/pre>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"340\" height=\"36\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-6.png\" alt=\"\" class=\"wp-image-10218\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-6.png 340w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-6-300x32.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-6-18x2.png 18w\" sizes=\"(max-width: 340px) 100vw, 340px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">8. \u0e15\u0e23\u0e27\u0e08\u0e2a\u0e2d\u0e1a Certificate<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e21\u0e37\u0e48\u0e2d\u0e40\u0e23\u0e32\u0e43\u0e0a\u0e49\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07 show run \u0e08\u0e30\u0e40\u0e2b\u0e47\u0e19 trustpoint \u0e43\u0e2b\u0e21\u0e48 \u0e41\u0e25\u0e30 Certificate \u0e43\u0e2b\u0e21\u0e48\u0e04\u0e23\u0e31\u0e1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"670\" height=\"458\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-7.png\" alt=\"\" class=\"wp-image-10219\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-7.png 670w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-7-300x205.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-7-18x12.png 18w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">9. \u0e15\u0e23\u0e27\u0e08\u0e2a\u0e2d\u0e1a\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e21\u0e37\u0e48\u0e2d\u0e40\u0e02\u0e49\u0e32\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19 GUI \u0e1c\u0e48\u0e32\u0e19 https \u0e08\u0e30\u0e21\u0e35 certificate \u0e43\u0e2b\u0e21\u0e48\u0e15\u0e2d\u0e1a\u0e01\u0e25\u0e31\u0e1a\u0e21\u0e32\u0e1c\u0e48\u0e32\u0e19 web browser \u0e04\u0e23\u0e31\u0e1a \u0e41\u0e25\u0e30\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e40\u0e02\u0e49\u0e32\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19 GUI \u0e1c\u0e48\u0e32\u0e19 https \u0e44\u0e14\u0e49<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"792\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-8.png\" alt=\"\" class=\"wp-image-10220\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-8.png 900w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-8-300x264.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-8-768x676.png 768w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-8-14x12.png 14w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"527\" src=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-1024x527.png\" alt=\"\" class=\"wp-image-10222\" srcset=\"https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-1024x527.png 1024w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-300x155.png 300w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-768x396.png 768w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-1536x791.png 1536w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10-18x9.png 18w, https:\/\/www.ablenet.co.th\/wp-content\/uploads\/2026\/09\/image-10.png 1728w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u0e40\u0e1e\u0e37\u0e48\u0e2d\u0e19\u0e46\u0e17\u0e35\u0e48\u0e14\u0e39\u0e41\u0e25\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c Cisco \u0e2d\u0e32\u0e08\u0e40\u0e01\u0e34\u0e14\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e27\u0e48\u0e32 \u0e40\u0e21\u0e37\u0e48\u0e2d Upgrade Firmware \u0e02\u0e2d\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c \u0e44\u0e21\u0e48\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e40\u0e02\u0e49\u0e32\u0e2b\u0e19\u0e49\u0e32 GUI \u0e44\u0e14\u0e49 \u0e42\u0e14\u0e22\u0e21\u0e35 Error 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