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Asp.net web form based website shows error - ASP.NET Ajax client-side framework failed to load

Question:

While checking website today which is developed using asp.net webform(.net 4.0) around 2014 showed design breaks after checking I noticed that there are some error in the console.

Not sure why this error suddenly started to show today, could it be due to bad ajax file or some sort of corruption as I'm getting similar error for other .net webform based website.

Loading failed for the <script> with source “http://websiteXXX.com/WebResource.axd?d=5SzwYej-C6IKc2XpxIGxEfPBnEcnsf2ijNMwKQeX0lSjJNG1CITL_ccEdAhc9xkOkMH3UNhq3VffnlhP9ceQuCBQZ9A1&t=636284228160000000”. en:45 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=4703T7Y5WSJ6SFEORAs7TLPAUPSpREhARReV6nsNETm9tVLK2Dq8N6ACQJUEAS0DjutzONcr1hFIEIGSRb02Yzds6unaWYk0Ohm9J61iBoLLmCxrkhQjFyR9b-51N8NNgBUA6lvTG8lyESVXUaiyCKNUsfk1&t=2cc21b5c”. en:48 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=jD7G3ZzWS30OfGr1-nzBoUxKyXtcbfuUYnNKkjOZGxCnO6ofUqWV9Q6P3l0YDW3yvm8AHovCtFaRp9vVotwwbkptsVJrDUmLsVcCdzRHnCEQZpi4BhgxAcn5_BzyhsFgxPEfwQ2&t=3a1336b1”. en:49 Error: ASP.NET Ajax client-side framework failed to load. en:52:40 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=6GIfwW5NIk8YVdQUBoUSdw8_teFCLpaGZuXT9BltuBtMBUEgJauIENwvz-5lAHOHs7roSmFphXJzKtPwXs4IBi2qKo5Xu9asohZ7zQFIgLxsrV1UVTo2TGF-G5tW5spyJFcooTIB3CmNkKv4pPodTZKjAOM1&t=3a1336b1”. en:56 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=SVRd3p5sxqLRkNZvsASl_qHKNd_EsD7Em0z1kZZKsUc9VUS88b1ehlatIc09u_RZYKinP0KkpUsEIRoWZWC4V4wZCDW1PNIlcAGeQTMCunY5ABoS93xJu4W1URri3RraR6VbuQ2&t=3a1336b1”. en:57 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=liPBEJshRG6BfJiUI6H1bjejmsntTHSESj5435XDpzn7jyE3zjP5P8pDyWXQPYKGqJyDYemNYEDpOj7eaHhE_TOQimWjTafCcDEPT_-IzPUk98xa9g47-DPKVpM2PbSRDoVVXAjcFdErIMr9oPvCHUd3at41&t=3a1336b1”. en:58 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=so2-S6sCEWinHjunb1xKM3mqGuiQVUn2N01XLzPdqPR0Zn1x5urYVyz4vejCesXD7qdgPibO0HVa6T7ln_xJ-vgIuDjZGn77Bw51LNHPxM3LNNJvIsdIfVX7H_lY2o1Ld987I-fmlCUDFR6iEiv3_mEJAWs1&t=3a1336b1”. en:59 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=b5bmOM9G88P7EQM94ZrgSDUiVqbpJb90fw5Reep6EoPFByepzn_cWrrvCdRW-fdsjjAeoMp-XZC7F2KEh5i_u_4bCbS9-3byqjW8IOkiQl1mQEBCJmwnEK2DELKgsAaNlpuNlvx6h4CydmlBmkIf8hdTQkA1&t=3a1336b1”. en:60 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=5jy8bTvROjYGk4_2ZP4NEWwvKIpI0oldPhL_Eh6m3GrT6ekBrVTo7-GUSxIX6AD6PC5zSqLy8CN6EuZuPiWdFvsSCam2ki-hwabZoFuSQOLcYwuLOIy_SE7zEe0ytt-m15CycOfApMHv9-RV3sqIMlLd8Xg1&t=3a1336b1”. en:61 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=rmhvV2xwmzqQwS31J44KQbyMR_zRMpUsEAzR2k4zbzQCgANnXCYEh58kTigCaSZ8LT8wrEnzng7fUI8tLzuVwJOyZbmRHqUZZbHk_03U5BHmWNQMhYAEwyVCaAZIeNDVzQIsHHmQ44Soi71NtaKVf6__bFwTaskur12ttbkfE20oCBud0&t=3a1336b1”. en:62 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=ZNlBs49UYPsWsh1g9g1-3JSj-0tbIQUGbXQP2qwLK1NKGoBKleisjmI-ljano_dkMzL9cyZcEtPSV3Nhres0GcJJTZaM8XQsJWyno5JUrGS0HJsVtsAzlWneSl0XJZp9rdG8zz1palq3F8_Wsj67W1KiUyc1&t=3a1336b1”. en:63 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=bdIISdk0xOnOOnKm5Lg0V3RHL-LtjxpWdqYP2FQFT3I__XsATZOwY_tamhbv9vEnFGuUjIauXgv27hfO3XcF2nXfkzyXjVKY6ouAzcNC7Z9yIKfO5PWbQ8i8CFLxEMO43TCl_VIh8mFv9pYZllMnJC96TLE1&t=3a1336b1”. en:64 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=QZwq1tBmc9srltGXrElP8CgnXBmRsy0QkmV1k7sc16SDweMp3N1RcU7MwtqawWy5tvyiJNg2cDqZ7ijTi1VcWgr8BMTibHYR0uI2ssS0O_OV2FQkh3B6L8557KiFL2aZ8yzJp8IiyCHYmP2rHlthqZ_TsPZKRjCFhDHdWWZVB5BobQMc0&t=3a1336b1”. en:65 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=m_5nYCrZRv0cBHzoHwFw88IyLI68CfWpjJ_WshaxE3-h39TmNXR9dsYGPJsSAjbXCTy7rqIMgCBJ9asmKjDYA3CZoGMYu0umX80AkS1hxXw23cepeBSLvq0lHlmaWiGP3w5CM6SU_XFJSdOyHG4-H05h3lA1&t=3a1336b1”. en:66 Loading failed for the <script> with source “http://websiteXXX.com/ScriptResource.axd?d=t3aTCyZK7M6vzByezVVz_Cs0icKbhxAXxjsT9TQHsWLpMN-bibYGdivH_AqRtO6GZVutz7zUpsy2Aj14_YTFjxra307vqvp5wFDQSEOPF-jF7-lJ7lKtiEQZ_XnrdxT2ws9xXL7Z2L51cQzRqIVWPJ7SMsA1&t=3a1336b1”. en:67 ReferenceError: Sys is not defined [Learn More] en:75:1 ReferenceError: Sys is not defined [Learn More] en:1131:1 ReferenceError: Sys is not defined [Learn More] en:1134:1 Use of getPreventDefault() is deprecated. Use defaultPrevented instead.

For even single .net based website I'm getting below error

WebResource.axd?d=pynGkmcFUV13He1Qd6_TZG4nAkbmoskOtxxp5ySS-SKn9PX36JMmpseXOU7BCTEiPJsUpsbpzfd66G07Bi3ozQ2&t=6362842281600

Worth mentioning that this error only happens on production server not the local server since this morning.

Answer1:

After spending hours resolving this issue it came to our knowledge that there was nothing wrong with the server it was local firewall which was blocking following files

http://website.com/WebResource.axd?d=5SzwYej-C6IKc2XpxIGxEfPBnEcnsf2ijNMwKQeX0lSjJNG1CITL_ccEdAhc9xkOkMH3UNhq3VffnlhP9ceQuCBQZ9A1&t=636284228160000000 http://website.com/ScriptResource.axd?d=jD7G3ZzWS30OfGr1-nzBoUxKyXtcbfuUYnNKkjOZGxCnO6ofUqWV9Q6P3l0YDW3yvm8AHovCtFaRp9vVotwwbkptsVJrDUmLsVcCdzRHnCEQZpi4BhgxAcn5_BzyhsFgxPEfwQ2&t=3a1336b1

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