This issue has been resolved and zones with Argo enabled should no longer see any issues.
We have implemented a fix for this issue and are currently monitoring the results. We will update once we have confirmed it is resolved.
Cloudflare is observing network performance issues resulting in 500 response codes for zones with Argo enabled. We are actively working to reduce or eliminate any impact to Internet users with this enabled.
This incident affected: Europe (Amsterdam, Netherlands - (AMS), Athens, Greece - (ATH), Barcelona, Spain - (BCN), Belgrade, Serbia - (BEG), Berlin, Germany - (TXL), Brussels, Belgium - (BRU), Bucharest, Romania - (OTP), Budapest, Hungary - (BUD), Copenhagen, Denmark - (CPH), Dublin, Ireland - (DUB), Düsseldorf, Germany - (DUS), Frankfurt, Germany - (FRA), Hamburg, Germany - (HAM), Helsinki, Finland - (HEL), Kiev, Ukraine - (KBP), Lisbon, Portugal - (LIS), London, United Kingdom - (LHR), Madrid, Spain - (MAD), Manchester, United Kingdom - (MAN), Marseille, France - (MRS), Milan, Italy - (MXP), Moscow, Russia - (DME), Munich, Germany - (MUC), Oslo, Norway - (OSL), Paris, France - (CDG), Prague, Czech Republic - (PRG), Rome, Italy - (FCO), Sofia, Bulgaria - (SOF), Stockholm, Sweden - (ARN), Vienna, Austria - (VIE), Warsaw, Poland - (WAW), Zagreb, Croatia - (ZAG), Zürich, Switzerland - (ZRH)), Africa (Cairo, Egypt - (CAI), Cape Town, South Africa - (CPT), Djibouti City, Djibouti - (JIB), Johannesburg, South Africa - (JNB), Luanda, Angola - (LAD), Mombasa, Kenya - (MBA)), Asia (Bangkok, Thailand - (BKK), Chengdu, China - (CTU), Chennai, India - (MAA), Colombo, Sri Lanka - (CMB), Dongguan, China - (SZX), Foshan, China - (FUO), Fuzhou, China - (FOC), Guangzhou, China - (CAN), Hangzhou, China - (HGH), Hengyang, China - (HNY), Hong Kong, Hong Kong - (HKG), Jinan, China - (TNA), Kuala Lumpur, Malaysia - (KUL), Langfang, China - (NAY), Luoyang, China - (LYA), Manila, Philippines - (MNL), Mumbai, India - (BOM), Nanning, China - (NNG), New Delhi, India - (DEL), Osaka, Japan - (KIX), Qingdao, China - (TAO), Seoul, South Korea - (ICN), Shenyang, China - (SHE), Shijiazhuang, China - (SJW), Singapore, Singapore - (SIN), Suzhou, China - (SZV), Taipei, Taiwan - (TPE), Tianjin, China - (TSN), Tokyo, Japan - (NRT), Wuhan, China - (WUH), Wuxi, China - (WUX), Xi'an, China - (XIY), Yerevan, Armenia - (EVN), Zhengzhou, China - (CGO), Zuzhou, China - (CSX)), North America (Ashburn, VA, United States - (IAD), Atlanta, GA, United States - (ATL), Boston, MA, United States - (BOS), Chicago, IL, United States - (ORD), Dallas, TX, United States - (DFW), Denver, CO, United States - (DEN), Detroit, MI, United States - (DTW), Kansas City, MO, United States - (MCI), Las Vegas, NV, United States - (LAS), Los Angeles, CA, United States - (LAX), Miami, FL, United States - (MIA), Minneapolis, MN, United States - (MSP), Montréal, QC, Canada - (YUL), Nashville, TN, United States - (BNA), Newark, NJ, United States - (EWR), Omaha, NE, United States - (OMA), Phoenix, AZ, United States - (PHX), Portland, OR, United States - (PDX), San Diego, CA, United States - (SAN), San Jose, CA, United States - (SJC), Seattle, WA, United States - (SEA), St. Louis, MO, United States - (STL), Tampa, FL, United States - (TPA), Toronto, ON, Canada - (YYZ), Vancouver, BC, Canada - (YVR)), Oceania (Auckland, New Zealand - (AKL), Brisbane, QLD, Australia - (BNE), Melbourne, VIC, Australia - (MEL), Perth, WA, Australia - (PER), Sydney, NSW, Australia - (SYD)), Latin America & the Caribbean (Buenos Aires, Argentina - (EZE), Lima, Peru - (LIM), Medellín, Colombia - (MDE), Panama City, Panama - (PTY), Quito, Ecuador - (UIO), Rio de Janeiro, Brazil - (GIG), São Paulo, Brazil - (GRU), Valparaíso, Chile - (SCL), Willemstad, Curaçao - (CUR)), and Middle East (Doha, Qatar - (DOH), Dubai, United Arab Emirates - (DXB), Kuwait City, Kuwait - (KWI), Muscat, Oman - (MCT)).