{"id":18185,"date":"2026-10-09T04:11:44","date_gmt":"2026-10-09T10:11:44","guid":{"rendered":"https:\/\/www.supportpro.com\/blog\/?p=18185"},"modified":"2026-10-09T04:12:11","modified_gmt":"2026-10-09T10:12:11","slug":"troubleshooting-aws-vpc-routing-issues-that-break-applications","status":"publish","type":"post","link":"https:\/\/www.supportpro.com\/blog\/troubleshooting-aws-vpc-routing-issues-that-break-applications\/","title":{"rendered":"\u00a0Troubleshooting AWS VPC Routing Issues That Break Applications"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The AWS VPC routing problem can be solved by checking each network element to determine where the traffic is being stopped or improperly routed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AWS VPC routing is used in AWS Virtual Private Cloud for traffic management.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The incorrect routing settings in the route tables of the VPC could cause trouble in the communication of the application with its database, servers, or the internet because of the absence of routes, incorrect configuration of gateways, or incorrect association of the subnet. These factors could result in poor performance of the application, connection timeouts, and even failure of the whole system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common reasons,<br><br>1. The application can\u2019t reach the internet<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2. The instances do not communicate with each other<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3. The database connection fails<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4. The load balancer is not reachable<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5. The VPN connectivity is broken&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Checking route table<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">First, we need to check the route table configuration.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Log in to the AWS console &gt;&gt; Click on VPC &gt;&gt; Route tables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Afetr login&nbsp; that page, we need to check the subnet configuration as per the resources<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For eg:-<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10.0.0.0\/21: it is associated with local<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0.0.0.0\/0 its for the local gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">192.2.5.154\/16: it&#8217;s associated for vpn&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common reason<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The default route may be missing\u00a0<\/li>\n\n\n\n<li>The target configuration may be wrong<\/li>\n\n\n\n<li>The CIDR block may be incorrect<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">B. Check the subnet type:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are two subnets; we need to check which subnet is associated with the particular instance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Public subnets like this&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0.0.0.0\/0 its internet gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Private subnet like this&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0.0.0.0\/0 NAT gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C . Check the internet gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Click on VPC&gt;&gt; Internet Gateways<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Please check the following things and confirm them<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The internet gateway exists\u00a0<\/li>\n\n\n\n<li>The instance is attached to the correct VPC\u00a0<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. The route table searches the correct gateway<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1.png\" data-rel=\"penci-gallery-image-content\" ><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"494\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-1024x494.png\" alt=\"\" class=\"wp-image-18187\" style=\"aspect-ratio:2.0730897009966776;width:624px;height:auto\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-1024x494.png 1024w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-300x145.png 300w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-768x370.png 768w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-1170x564.png 1170w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1-585x282.png 585w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1.png 1394w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image.png\" data-rel=\"penci-gallery-image-content\" ><img decoding=\"async\" width=\"1024\" height=\"440\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1024x440.png\" alt=\"\" class=\"wp-image-18186\" style=\"aspect-ratio:2.328358208955224;width:624px;height:auto\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1024x440.png 1024w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-300x129.png 300w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-768x330.png 768w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-1170x503.png 1170w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-585x252.png 585w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image.png 1342w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">D. Check the NAT gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I would like to tell you that the private instances need outbound instances<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a. Need to check the following things<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b. The NAT gateway is available; it&#8217;s located in the public subnet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C. Check if the IP is assigned or not<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D. The route table should be pointing to the NAT gateway.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you notice the NAT gateway is still routing to the wrong route table, kindly remove it&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6. Check Security Group<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the routing tables are correctly set, but sometimes the security group is causing an issue, and it may be causing traffic to be blocked&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Need to check the inbound rule and outbound rule<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>HTTP(80)<\/li>\n\n\n\n<li>HTTPS(443)<\/li>\n\n\n\n<li>SSH(22)<\/li>\n\n\n\n<li>Database ports (3306)<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Please check that all outbound ports are allowed<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E. Kindly check the network ACL<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kindly check and verify the inbound and outbound rules&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The inbound rule is allowed, but the outbound rule is denied in this case, outbound&nbsp; ip\u2019s are denied<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">F. Check the instance configuration<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, go to the E2 check IP route.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using the command ip route&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also use IP address and check all network configurations&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kindly check if the correct private IP is assigned or not&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also confirm the subnet mask if there is any default gateway present or not<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>G. Test the connection&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use different networking tools to check network connectivity<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check ping.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eg:-&nbsp; Ping 8.8.8.8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check Tracert&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eg:- Tracert 8.8.8.8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also check the DNS test.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nslookup google.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To test the HTTP connection using the curl command&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Like curl <a href=\"https:\/\/google.com\">https:\/\/google.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H. DNS setting&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, access the vpc &gt;&gt; DNS settings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Please verify the dns settings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kindly confirm DNS resolution and DNS hostname are both enabled&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We can also check the configuration using the command below<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cat \/etc\/resolve.conf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>I: DNS Resolution: &#8211;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As per checking, it was found that many networks are having DNS issues<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To check the issue&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Nslookup <a href=\"http:\/\/api.example.com\">api.example.com<\/a><\/li>\n\n\n\n<li>dig <a href=\"http:\/\/api.example.com\">api.example.com<\/a><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Kindly check that DNS resolution and hostname are enabled<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J. Check the reachability analyzer<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Check the route tables<\/li>\n\n\n\n<li>Check NetACLs<\/li>\n\n\n\n<li>Check VPC peering<\/li>\n\n\n\n<li>Check the security groups<\/li>\n\n\n\n<li>Check the network transit<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">J: Kindly enable VPC flow logs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In order to resolve the AWS VPC routing problem, look at each network device to identify if there is any issue that is blocking traffic from getting through.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Please check the output below<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accept TCP 10.0.1.15 10.0.2.10 443<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reject TCP 10.0.1.15 10.0.2.1 443<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=====================<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common routing issue with resolution<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. Unable to get an internet connection<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing Internet Gateway route<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2. Unable to download packages on private instances<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing NAT Gateway<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3. EC2 unable to communicate with RDS<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Security Group or NACL restriction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4. Unable to establish cross-VPC connectivity<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Missing peering routes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5. VPN unable to access VPC<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">VPN route propagation issue<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6. Intermittent problem<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NACL blocking ephemeral ports<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7. DNS resolves but unable to connect<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect route or security group<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8. Works in one subnet only<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wrong subnet-to-route-table association<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2.png\" data-rel=\"penci-gallery-image-content\" ><img decoding=\"async\" width=\"1024\" height=\"665\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-1024x665.png\" alt=\"\" class=\"wp-image-18188\" style=\"aspect-ratio:1.5407407407407407;width:624px;height:auto\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-1024x665.png 1024w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-300x195.png 300w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-767x498.png 767w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-1170x760.png 1170w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2-585x380.png 585w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-2.png 1471w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-1024x566.png\" alt=\"\" class=\"wp-image-18189\" style=\"aspect-ratio:1.808695652173913;width:624px;height:auto\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-1024x566.png 1024w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-300x166.png 300w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-766x424.png 766w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-1536x850.png 1536w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-1170x647.png 1170w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3-585x324.png 585w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2026\/10\/image-3.png 1654w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile is-vertically-aligned-center has-white-background-color has-background\"><div class=\"wp-block-media-text__content\">\n<p class=\"has-large-font-size wp-block-paragraph\">Facing issues? <\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">Our technical support<br>engineers can solve it. <\/p>\n\n\n\n<!--HubSpot Call-to-Action Code --><span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-3350a795-db50-482f-9911-301930d1b1be\"><span class=\"hs-cta-node hs-cta-3350a795-db50-482f-9911-301930d1b1be\" id=\"hs-cta-3350a795-db50-482f-9911-301930d1b1be\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/2725694\/3350a795-db50-482f-9911-301930d1b1be\" ><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-3350a795-db50-482f-9911-301930d1b1be\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/2725694\/3350a795-db50-482f-9911-301930d1b1be.png\"  alt=\"Contact Us today!\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(2725694, '3350a795-db50-482f-9911-301930d1b1be', {\"useNewLoader\":\"true\",\"region\":\"na1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code -->\n<\/div><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"904\" height=\"931\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png\" alt=\"guy server checkup\" class=\"wp-image-12943 size-full\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png 904w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-291x300.png 291w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-768x791.png 768w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-585x602.png 585w\" sizes=\"(max-width: 904px) 100vw, 904px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The AWS VPC routing problem can be solved by checking each network element to determine where the traffic is being stopped or improperly routed. AWS VPC routing is used in&hellip;<\/p>\n","protected":false},"author":39,"featured_media":18190,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-18185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-miscellaneous"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn how to troubleshoot AWS VPC routing issues by checking route tables, gateways, security groups, network ACLs, DNS settings, and VPC Flow Logs\" \/>\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"Anjali Sindhu\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.supportpro.com\/blog\/troubleshooting-aws-vpc-routing-issues-that-break-applications\/\" 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